<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0798-7269</journal-id>
<journal-title><![CDATA[Zootecnia Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Zootecnia Trop.]]></abbrev-journal-title>
<issn>0798-7269</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Agricolas INIA, Maracay, Venezuela. ]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0798-72692010000300010</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Avaliação genética do crescimento de tilápia do Nilo em condiçoesn de baixa temperatura]]></article-title>
<article-title xml:lang="en"><![CDATA[Genetic evaluation of Nile tilapia in naturals conditions of low temperature]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación genética del crecimiento de la tilapia de Nilo en condiciones naturales de baja temperatura]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fortes-Silva]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[de Almeida Torres]]></surname>
<given-names><![CDATA[Roble]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ribeiro-Filho]]></surname>
<given-names><![CDATA[Oswaldo Pinto]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopes Schiavetti]]></surname>
<given-names><![CDATA[Victor]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maia Pereira]]></surname>
<given-names><![CDATA[Marcelo]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Teixeira Bastos]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yamaki]]></surname>
<given-names><![CDATA[Marcos]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rocha Sarmento]]></surname>
<given-names><![CDATA[José Lindenberg]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,UMU Departamento de Fisiología Animal ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<aff id="A02">
<institution><![CDATA[,UFV Departamento de Zootecnia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A03">
<institution><![CDATA[,UFV Departamento de Biologia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A04">
<institution><![CDATA[,CEFET  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Melhorista genético Sadia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="A06">
<institution><![CDATA[,IEFS Departamento de Genética e Melhoramento Animal ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2010</year>
</pub-date>
<volume>28</volume>
<numero>3</numero>
<fpage>395</fpage>
<lpage>401</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0798-72692010000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0798-72692010000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0798-72692010000300010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Os parâmetros genéticos para criar ou aperfeiçoar programas de melhoramento genético para peso corporal são escassos. Para avaliar o potencial da seleção massal para o crescimento, os parâmetros genéticos são necessários. O objetivo deste estudo foi estimar parâmetros genéticos de características de crescimento em tilápia do Nilo (Oreochromis niloticus) em condição natural de baixa temperatura. Foi utilizada a informação de 800 irmãos completos provenientes de 20 famílias. Os peixes foram pesados a cada 12 ± 2 dias do nascimento até o final do experimento (150 dias). O proc mixed foi utilizado para estimar as variancas e covariancas e obter as herdabilidades e covariqancas, sendo aplicado modelo de unicaracteristica via REML considerando como efeito fixo o grupo contemporâneo (tanque e sexo), e efeito genético (animal). As medidas gerais para peso aos 60 dias (P60), peso aos 150 dias (P150g), comprimento aos 60 dias (C60), comprimento aos 150 dias (C150), ganho de peso diário (GPD), ganho de comprimento diário (GCD), carcaça eviscerada (CE) e rendimento de carcaça (RC) foram: 31,62g; 220,54g; 10,50cm; 90,60cm; 1,68g; 0,69cm; 83,89g; 0,87g respectivamente. Os valores altos de herdabilidade e de correlação genética para peso corporal e rendimento de carcaça obtido para a tilápia do Nilo neste trabalho poderão ser explorados em futuros trabalhos de melhoramento, com o objetivo de aumentar a proporção destas características em relação ao peso]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Genetic parameters to design or optimize breeding programs for these body weights are lacking. To evaluate the potential of mass selection for growth, genetic parameters are required. The goal of this study was estimate genetic parameters of growth characteristics in Nile tilápia (Oreochromis niloticus) in naturals conditions of low temperature. Information on 800 full-sib provide by 20 families was used. Fishes were weighed every 12 ± 2 days until end of experiment (150 days). Proc Mixed was used to evaluate the variance and covariance components and to obtain heritability and correlations. Unicharacteristic model via REML, considering fixed effect the contemporary group (tank and sex) and genetic effect (animal) was used. Measurements for weight at 60 days (W60), weight at 150 days (W150), length at 60 days (L60), length to 150 days (L150), daily weight gain (DWG), daily length gain (DLG), Carcass (EC) and carcass efficiency (CE) were: 31,62g; 220,54g; 10,50cm; 90,60cm; 1,68g; 0,69cm; 83,89g; 0,87g respectively. High heritability and genetic correlation for body weight and eviscerated dressing Values of Nile Tilapia obtained in this study, can be used in future studies of animal breeding, intending to increase the proportion characteristics related to body weight]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Con la finalidad de evaluar geneticamente el crecimiento de la tilapia de Nilo en condiciones naturales de baja temperatura, se utilizó una información de 800 peces hermanos provenientes de 20 familias, quienes fueron pesados cada 12 ± 2 días después del nacimiento hasta el final del experimento (150 días). La estimación de la varianza, covarianza y las correlaciones se obtuvieron utilizando el Proc Mixed, aplicando el modelo univariado mediante REML. La heredabilidad fue alta: 0,91 y 1,36 a los 60 y 150 días, respectivamente. Se registró una longitud de 0,94 y 0,95 a los días 60 y 150, respectivamente. La ganancia diaria de peso y la ganancia diaria de longitud fueron 0,87 y 0,60. El rendimiento de carcaza sin viseras y con viseras oscila entre el 1,00 y 0,21, respectivamente. Los altos valores observados en la heredabilidad, la correlación genética del peso corporal y el rendimiento de la carcaza obtenidos en este estudio, podrían ser explotados en futuros trabajos con el objetivo de potenciar estos parámetros para obtener una mayor ganancia de peso]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[estimação]]></kwd>
<kwd lng="pt"><![CDATA[parâmetros genéticos]]></kwd>
<kwd lng="pt"><![CDATA[Oreochromis niloticus]]></kwd>
<kwd lng="en"><![CDATA[estimation]]></kwd>
<kwd lng="en"><![CDATA[genetics parameters]]></kwd>
<kwd lng="en"><![CDATA[Oreochromis niloticus]]></kwd>
<kwd lng="es"><![CDATA[estimación]]></kwd>
<kwd lng="es"><![CDATA[parametros genéticos]]></kwd>
<kwd lng="es"><![CDATA[Oreochromis niloticus]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p style="word-spacing: 0; line-height: 100%" align="center"><font face="Verdana" size="3"><b>Avaliação genética do crescimento de tilápia do Nilo em condiçoesn de baixa temperatura</b></font></p>     <p style="word-spacing: 0; line-height: 100%" align="center"><font face="Verdana" size="2"><b>Rodrigo Fortes-Silva <sup>1*</sup> Roble de Almeida Torres <sup>2</sup>, Oswaldo Pinto Ribeiro-Filho <sup>3</sup>, Victor Lopes Schiavetti <sup>2</sup>, Marcelo Maia Pereira <sup>3</sup>, Rafael Teixeira Bastos <sup>4</sup>, Marcos Yamaki <sup>5</sup> e José Lindenberg Rocha Sarmento <sup>6</sup>.</b></font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><sup>1</sup> Universidad de Murcia (UMU). Departamento de Fisiología Animal. 30003 Murcia. España. *Correo electrónico: <a href="mailto:fortesrs@yahoo.com.br">fortesrs@yahoo.com.br</a>.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><sup>2 </sup>Universidade Federal de Viçosa (UFV). Departamento de Zootecnia. 36571-000 Viçosa-MG. Brasil.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><sup>3</sup> UFV. Departamento de Biologia. 36571-000 Viçosa-MG. Brasil.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><sup>4 </sup>Instituto Federal Minas Gerais. (CEFET). 38900-000 Bambuí - MG. Brasil.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><sup>5</sup> Melhorista genético Sadia. Concórdia-SC. Brasil.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><sup>6</sup> Universidade Federal do Piauí (IEFS). Departamento de Genética e Melhoramento Animal. Piauí - PI. Brasil.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><b>RESUMO</b></font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2">Os parâmetros genéticos para criar ou aperfeiçoar programas de melhoramento genético para peso corporal são escassos. Para avaliar o potencial da seleção massal para o crescimento, os parâmetros genéticos são necessários. O objetivo deste estudo foi estimar parâmetros genéticos de características de crescimento em tilápia do Nilo (Oreochromis niloticus) em condição natural de baixa temperatura. Foi utilizada a informação de 800 irmãos completos provenientes de 20 famílias. Os peixes foram pesados a cada 12 ± 2 dias do nascimento até o final do experimento (150 dias). O proc mixed foi utilizado para estimar as variancas e covariancas e obter as herdabilidades e covariqancas, sendo aplicado modelo de unicaracteristica via REML considerando como efeito fixo o grupo contemporâneo (tanque e sexo), e efeito genético (animal). As medidas gerais para peso aos 60 dias (P60), peso aos 150 dias (P150g), comprimento aos 60 dias (C60), comprimento aos 150 dias (C150), ganho de peso diário (GPD), ganho de comprimento diário (GCD), carcaça eviscerada (CE) e rendimento de carcaça (RC) foram: 31,62g; 220,54g; 10,50cm; 90,60cm; 1,68g; 0,69cm; 83,89g; 0,87g respectivamente. Os valores altos de herdabilidade e de correlação genética para peso corporal e rendimento de carcaça obtido para a tilápia do Nilo neste trabalho poderão ser explorados em futuros trabalhos de melhoramento, com o objetivo de aumentar a proporção destas características em relação ao peso.</font></p>     ]]></body>
<body><![CDATA[<p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><b>Palavras Chave: </b>estimação, parâmetros genéticos, Oreochromis niloticus.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="center"><font face="Verdana" size="2"><b>Genetic evaluation of Nile tilapia in naturals conditions of low temperature</b></font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><b>ABSTRACT</b></font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2">Genetic parameters to design or optimize breeding programs for these body weights are lacking. To evaluate the potential of mass selection for growth, genetic parameters are required. The goal of this study was estimate genetic parameters of growth characteristics in Nile tilápia (Oreochromis niloticus) in naturals conditions of low temperature. Information on 800 full-sib provide by 20 families was used. Fishes were weighed every 12 ± 2 days until end of experiment (150 days). Proc Mixed was used to evaluate the variance and covariance components and to obtain heritability and correlations. Unicharacteristic model via REML, considering fixed effect the contemporary group (tank and sex) and genetic effect (animal) was used. Measurements for weight at</font> <font face="Verdana" size="2">60 days (W60), weight at 150 days (W150), length at 60 days (L60), length to 150 days (L150), daily weight gain (DWG), daily length gain (DLG), Carcass (EC) and carcass efficiency (CE) were: 31,62g; 220,54g; 10,50cm; 90,60cm; 1,68g; 0,69cm; 83,89g; 0,87g respectively. High heritability and genetic correlation for body weight and eviscerated dressing Values of Nile Tilapia obtained in this study, can be used in future studies of animal breeding, intending to increase the proportion characteristics related to body weight.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><b>Keywords:</b> estimation, genetics parameters, Oreochromis niloticus.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="center"><font face="Verdana" size="2"><b>Evaluación genética del crecimiento de la tilapia de Nilo en condiciones naturales de baja temperatura</b></font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2">Con la finalidad de evaluar geneticamente el crecimiento de la tilapia de Nilo en condiciones naturales de baja temperatura, se utilizó una información de 800 peces hermanos provenientes de 20 familias, quienes fueron pesados cada 12 ± 2 días después del nacimiento hasta el final del experimento (150 días). La estimación de la varianza, covarianza y las correlaciones se obtuvieron utilizando el Proc Mixed, aplicando el modelo univariado mediante REML. La heredabilidad fue alta: 0,91 y 1,36 a los 60 y 150 días, respectivamente. Se registró una longitud de 0,94 y 0,95 a los días 60 y 150, respectivamente. La ganancia diaria de peso y la ganancia diaria de longitud fueron 0,87 y 0,60. El rendimiento de carcaza sin viseras y con viseras oscila entre el 1,00 y 0,21, respectivamente. Los altos valores observados en la heredabilidad, la correlación genética del peso corporal y el rendimiento de la carcaza obtenidos en este estudio, podrían ser explotados en futuros trabajos con el objetivo de potenciar estos parámetros para obtener una mayor ganancia de peso.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><b>Palabras clave: </b>estimación, parametros genéticos, Oreochromis niloticus.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><b>Recibido:</b> 25/06/09 <b>Aceptado:</b> 05/11/1</font></p>     ]]></body>
<body><![CDATA[<p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2"><b>INTRODUÇÃO</b></font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2">O Brasil ocupa considerável posição no mercado internacional como produtor de pescado (Anualpec 2007), possuindo boas condições de clima que poderiam permitir aumentar consideravelmente sua produção (Peixoto et al., 2010). Todavia, devido à grande extensão territorial, existem regiões de baixas temperaturas anuais, porém com alguma importância no cultivo da tilápia devido à geração de emprego e renda nessas regiões. No estado de Santa Catarina, por exemplo, onde as temperaturas anuais geralmente são baixas, a produção anual de 2003 ultrapassou a Carpa comum (Cyprinus carpio L.) com o montante de 6.900 toneladas cultivadas (CEDAP, 2003).</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2">O crescente interesse na produção de tilápia aumentou a busca por programas de melhoramento genético para melhoria da produtividade (Rutten et al., 2005a,b; Ponzoni et al., 2005; Maluwa e Gjerde, 2006). Segundo Mackay et al. (1984) e Rutten et al. (2005a), é de fundamental importancia a avaliacao da interacao genotipica com a temperatura para obter melhores taxas de crescimento em trutas. Para estabelecer um programa genético, é necessário levar em consideração a importância das características que se deseja melhorar (Rezk et al., 2009). A estimação de parâmetros genéticos como herdabilidade e correlação para características de certa importância é um dos recursos necessários para implantação de um método de seleção e também para o sucesso de um programa de melhoramento de peixes (Tave, 1986; Falconer e Mackay, 1996). Dessa forma, é possível determinar uma estratégia ao programa de melhoramento genético nas condições ambientais em que se encontram os animais, de forma a possibilitar incremento nas características que se deseja melhorar.</font></p>     <p style="word-spacing: 0; line-height: 100%" align="justify"><font face="Verdana" size="2">Embora diversas instituições venham desenvolvendo pesquisas com tilápias persistem muitas duvidas com relação à criação desta espécie em regiões com temperaturas fora do seu padrão de conforto térmico (Graeff e Pruner, 2006).</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Este trabalho foi realizado com o objetivo de</font> <font face="Verdana" size="2">estimar parâmetros genéticos para características</font> <font face="Verdana" size="2">de produção em uma geração da tilápia do Nilo</font> <font face="Verdana" size="2">(Oreochromis niloticus), em condições naturais de</font> <font face="Verdana" size="2">baixa temperatura.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b>MATERIAL E MÉTODOS</b></font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b>Condição experimental</b></font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Este trabalho foi realizado no Departamento</font> <font face="Verdana" size="2">de Biologia, setor de ranicultura da Universidade</font> <font face="Verdana" size="2">Federal de Viçosa-UFV, Viçosa-MG, no período de</font> <font face="Verdana" size="2">01/03/2007 a 01/07/2007. As matrizes e reprodutores</font> <font face="Verdana" size="2">foram obtidos de uma fazenda localizada na zona</font> <font face="Verdana" size="2">rural de Paula Cândido-MG, Brasil. Com o objetivo</font> <font face="Verdana" size="2">de obter o controle dos acasalamentos, para a</font> <font face="Verdana" size="2">obtenção de irmãos completos contemporâneos,</font> <font face="Verdana" size="2">utilizou-se a técnica de sincronização da reprodução</font> <font face="Verdana" size="2">com extrato bruto de hipófise de carpa para obtenção</font> <font face="Verdana" size="2">de 20 famílias de irmãos completos.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">As larvas foram mantidas em tanques individuais</font> <font face="Verdana" size="2">de 150 l para posterior identificação. Aos 60 dias de</font> <font face="Verdana" size="2">idade, aleatoriamente 40 alevinos de cada família</font> <font face="Verdana" size="2">foram identificados de acordo com a marcação</font> <font face="Verdana" size="2">adaptada de (Faria et al., 2003) e repartidos em 5</font> <font face="Verdana" size="2">tanques de alvenaria com capacidade total de 5.000</font> <font face="Verdana" size="2">l cada. Assim, as informações utilizadas no presente</font> <font face="Verdana" size="2">estudo corresponderam ao registro de 800 animais.</font> <font face="Verdana" size="2">Todos os tanques possuíam sistema de abastecimento</font> <font face="Verdana" size="2">de água interligado de modo a permitir a mesma</font> <font face="Verdana" size="2">taxa de renovação e a mesma qualidade de água. A</font> <font face="Verdana" size="2">temperatura era mensurada duas vezes ao dia e a taxa</font> <font face="Verdana" size="2">de oxigênio e o pH eram mensurados semanalmente.</font> <font face="Verdana" size="2">A ração era fornecida até a aparente saciedade dos</font> <font face="Verdana" size="2">peixes, sendo realizadas as 08h00min, 13h00min e</font> <font face="Verdana" size="2">17h00min. Foi utilizada em todos os tanques ração</font> <font face="Verdana" size="2">comercial para tilápia com 30% de proteína bruta,</font> <font face="Verdana" size="2">9,40% energia digestível, 15,0%extrato etéreo, 7,89%</font> <font face="Verdana" size="2">cinzas e 91,3% de matéria seca.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">A partir dos 60 dias de idade foram realizadas dez</font> <font face="Verdana" size="2">biometrias até o final do experimento para obtenção</font> <font face="Verdana" size="2">do peso e comprimento. No momento das biometrias,</font> <font face="Verdana" size="2">peixes detectados com perda de marcação eram</font> <font face="Verdana" size="2">descartados, sendo utilizada a informação dos animais</font> <font face="Verdana" size="2">restantes. Aos 180 dias de idade realizou-se sexagem</font> <font face="Verdana" size="2">de todos os indivíduos e os peixes foram anestesiados</font> <font face="Verdana" size="2">e sacrificados para a obtenção do rendimento de</font> <font face="Verdana" size="2">carcaça e peso de carcaça eviscerada. A média da</font> <font face="Verdana" size="2">temperatura para todo o período experimental esteve</font> <font face="Verdana" size="2">em 21 ± 40C, chagando a 17 ± 10C no ultimo mês de</font> <font face="Verdana" size="2">experimentação.</font></p>     ]]></body>
<body><![CDATA[<p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b>Analise dos dados</b></font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">As variáveis consideradas para o estudo foram:</font> <font face="Verdana" size="2">peso aos 60 dias de idade (P60), peso aos 150 dias</font> <font face="Verdana" size="2">de idade (P150), comprimento total aos 60 dias de</font> <font face="Verdana" size="2">idade (C60), comprimento total aos 150 dias de</font> <font face="Verdana" size="2">idade (C150), ganho de peso diário (GPD), ganho de</font> <font face="Verdana" size="2">comprimento diário (GCD), rendimento de carcaça</font> <font face="Verdana" size="2">total (RC) e carcaça eviscerada (CE).</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Os componentes de variância e covariância de</font> <font face="Verdana" size="2">acasalamento para a obtenção das herdabilidades</font> <font face="Verdana" size="2">e correlações foram estimados pelo Proc Mixed,</font> <font face="Verdana" size="2">aplicando modelo de unicaracterística via REML</font> <font face="Verdana" size="2">(Máxima Verossimilhança Restrita), utilizando o</font> <font face="Verdana" size="2">programa estatístico SAS (2004). Como variáveis</font> <font face="Verdana" size="2">ambientais (efeito fixo) foram consideradas grupo</font> <font face="Verdana" size="2">contemporâneo (tanque e sexo) e efeito genético</font> <font face="Verdana" size="2">(animal).</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">O modelo estatístico utilizado para este caso</font> <font face="Verdana" size="2">foi: y<sub>ijk </sub>= &#956; + s<sub>i</sub> + c<sub>j</sub> + e<sub>ijk </sub>em que: y<sub>ijk</sub> = animal k do</font> <font face="Verdana" size="2">acasalamento j do sexo i; &#956; = Méia geral; s<sub>i </sub>= Efeito</font> <font face="Verdana" size="2">fixo de sexo, i = 1,2; c<sub>j</sub> = Efeito do acasalamento j, j</font> <font face="Verdana" size="2">= 1,2, ..., 20, C<sub>i </sub>~ NID (0,&#963;<sup>2</sup></font> <font face="Verdana" size="2">c) ; e<sub>ijk</sub> = erro associado a</font> <font face="Verdana" size="2">cada observação y<sub>ijk</sub>.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Não foi considerado o efeito ambiental permanente</font> <font face="Verdana" size="2">materno uma vez que as larvas foram separadas</font> <font face="Verdana" size="2">das mães no segundo dia de vida. Utilizando a</font> <font face="Verdana" size="2">covariância entre irmãos-completos, o componente</font> <font face="Verdana" size="2">genético foi descrito como componente de variância</font> <font face="Verdana" size="2">de acasalamento que, em ternos de componentes</font> <font face="Verdana" size="2">genéticos foi:</font></p>     <p align="center" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">&#963;<sup>2</sup></font> <font face="Verdana" size="2"><sub>c</sub> = &#963; (IC) = 1/2 &#963;<sup>2</sup></font> <font face="Verdana" size="2"><sub>A</sub> + 1/ 4 &#963;<sup>2</sup></font> <font face="Verdana" size="2"><sub>D</sub> . Descrito por Silva</font> <font face="Verdana" size="2">(1980).</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">A herdabilidade foi estimada por:</font></p>     <p align="center" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="3"><span style="mso-fareast-font-family: Times New Roman; mso-ansi-language: ES; mso-fareast-language: ES; mso-bidi-language: AR-SA">h<sup>&#094;2</sup>= 2</span>&#963;<sup>2</sup><sub>c </sub>+ &#963;<sup>2</sup><sub>c</sub> + &#963;<sup>2</sup><sub>e</sub></font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">As correlações entre as características foram</font> <font face="Verdana" size="2">estimadas utilizando os componentes de covariância</font> <font face="Verdana" size="2">de acasalamento e calculadas do seguinte modo:</font></p>     <p align="center" style="word-spacing: 0; line-height: 100%"><img border="0" src="/img/fbpe/zt/v28n3/art10for1.jpg" align="center" width="359" height="161"></p>     
]]></body>
<body><![CDATA[<p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Em que: &#963;<sub>c</sub> <sub>(A,B)</sub> = Componente de covariância</font> <font face="Verdana" size="2">de acasalamento das características “A” e “B”,</font> <font face="Verdana" size="2">entre reprodutores; r<sub>g</sub> = Correlação Genética;</font> <font face="Verdana" size="2">r<sub>p</sub> = Correlação Fenotípica.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b>RESULTADOS E DISCUSSÃO</b></font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b>Valores fenotípicos</b></font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Segundo Kubitza (2000), a faixa de temperatura</font> <font face="Verdana" size="2">para a maximização do crescimento da espécie</font> <font face="Verdana" size="2">estudada situa-se entre 27ºC e 32 ºC, assim considerase</font> <font face="Verdana" size="2">que a temperatura esteve abaixo do recomendado</font> <font face="Verdana" size="2">para a tilapia. As médias fenotípicas para cada uma</font> <font face="Verdana" size="2">das variáveis de crescimento estudadas e seus devidos</font> <font face="Verdana" size="2">errores padrão estão representadas no <a href="#cuad1">Quadro 1</a>. As</font> <font face="Verdana" size="2">médias de peso aos 60 e 150 dias de idade foram de</font> <font face="Verdana" size="2">31,62 ± 7,01 e 220,54 ± 40,50 respectivamente.</font></p>     <p ALIGN="center"><font face="Verdana" size="2"><b><a name="cuad1">Quadro 1.</a></b> Componentes de variância e herdabilidade para as variáveis analisadas em tilápia do Nilo (Oreochromis niloticus).</font></p>     <p ALIGN="center"><img border="0" src="/img/fbpe/zt/v28n3/art10cuad1.jpg" align="center" width="573" height="257"></p>     
<p ALIGN="center"><font face="Verdana" size="2">P 60: peso aos 60 dias de idade, C 60: comprimento aos 60 dias de idade, P 150: peso aos 150 dias de idade, C 150: comprimento aos 150 dias de idade, GPD: ganho de peso diário, GCD: ganho de comprimento diário, CE: carcaça eviscerada e RC: rendimento de carcaça. &#963;<sup>2</sup><sub>e</sub>: variância ambiental, &#963;<sup>2</sup><sub>p</sub>: variância genética e h<sup>2</sup>: índice de herdabilidade. EP: error padrão.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Esses resultados foram consideravelmente</font> <font face="Verdana" size="2">superiores os encontrados por Graeff e Pruner (2006),</font> <font face="Verdana" size="2">que trabalhando com alevinos de tilápias com peso</font> <font face="Verdana" size="2">inicial de 41,0 ± 1,0g obtiveram animais de 99,3±6,0g</font> <font face="Verdana" size="2">aos 152 dias de idade. Esses dados foram devido à</font> <font face="Verdana" size="2">oscilação da temperatura que foi de 32,4ºC no final de</font> <font face="Verdana" size="2">junho a um mínimo de 7,2ºC. Os dados de comprimento</font> <font face="Verdana" size="2">aos 60 dias de idade (10,50 ± 0,98) e comprimento</font> <font face="Verdana" size="2">aos 150 dias de idade (90,60 ± 4,26) também foram</font> <font face="Verdana" size="2">superiores aos encontrados por estes autores. Graeff e</font> <font face="Verdana" size="2">Pruner (2006) confirmam que mesmo os peixes tendo</font> <font face="Verdana" size="2">um baixo rendimento no inverno, estes chegarão ao</font> <font face="Verdana" size="2">consumidor mais cedo devido a um maior peso dos</font> <font face="Verdana" size="2">alevinos na entrada do verão, o que justificaria sua</font> <font face="Verdana" size="2">criação em baixa temperatura.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Contudo, certas condições de temperatura devem</font> <font face="Verdana" size="2">ser respeitadas, pois abaixo de 20ºC o apetite fica</font> <font face="Verdana" size="2">comprometido e temperaturas na faixa de 8 a 14ºC</font> <font face="Verdana" size="2">podem ser letais, dependendo da espécie, linhagem e</font> <font face="Verdana" size="2">condição dos peixes e do ambiente (Kubitza, 2000).</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b>Parâmetros genéticos</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">O <a href="#cuad1">Quadro 1</a> representa os componentes de</font> <font face="Verdana" size="2">variância e herdabilidade (h2) e seus respectivos</font> <font face="Verdana" size="2">errores padrão das análises univariadas para cada</font> <font face="Verdana" size="2">uma das características de crescimento.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">As estimativas de herdabilidades foram de</font> <font face="Verdana" size="2">moderadas a altas, portanto, diferenças genéticas</font> <font face="Verdana" size="2">entre os indivíduos são responsáveis, em grande</font> <font face="Verdana" size="2">parte, pela variação fenotípica da característica, o</font> <font face="Verdana" size="2">que permite predizer valores genéticos por meio</font> <font face="Verdana" size="2">dos valores fenotípicos, pois o componente genético</font> <font face="Verdana" size="2">é altamente relevante dentro da expressão total da</font> <font face="Verdana" size="2">variação. A herdabilidade para P60, foi estimada em</font> <font face="Verdana" size="2">um valor maior que 1.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">De igual modo, Neira et al. (2006), trabalhando com</font> <font face="Verdana" size="2">salmão Coho (Oncorhynchus kisutch), selecionando</font> <font face="Verdana" size="2">populações para peso na despesca durante 4 gerações</font> <font face="Verdana" size="2">encontraram também valor maior do que 1. O autor</font> <font face="Verdana" size="2">concluiu que a resposta foi superestimada devido a um</font> <font face="Verdana" size="2">efeito ambiental positivo que não foi quantificado. O</font> <font face="Verdana" size="2">valor da herdabilidade para (P150) de (0,91), foi maior</font> <font face="Verdana" size="2">do que aqueles encontrados por Charo-Karisa et al.,</font> <font face="Verdana" size="2">(2006), que observaram estimativa de herdabilidades</font> <font face="Verdana" size="2">para peso corporal na idade de abate de 0,60, 0,38</font> <font face="Verdana" size="2">e 0,51 em três gerações sucessivas para tilápia do</font> <font face="Verdana" size="2">Nilo. Contudo, a literatura indica vasta variação da</font> <font face="Verdana" size="2">estimativa da herdabilidades (Tave e Smitherman,</font> <font face="Verdana" size="2">1980; Bolívar e Newkirk, 2002; Ponzoni et al., 2005;</font> <font face="Verdana" size="2">Rutten et al., 2005 a,b) para peso corporal de tilápia</font> <font face="Verdana" size="2">do Nilo adultas em diferentes sistemas de produção.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">As estimativas de herdabilidades para C60 e</font> <font face="Verdana" size="2">C150 tiveram valores altos e semelhantes entre</font> <font face="Verdana" size="2">si, e as estimativas para GPD e CE consideradas</font> <font face="Verdana" size="2">também altas, podem ter ocorrido devido ao fato das</font> <font face="Verdana" size="2">herdabilidades terem sido estimadas apenas em uma</font> <font face="Verdana" size="2">geração que não sofreu nenhum processo de seleção.</font> <font face="Verdana" size="2">Segundo Carvalho et al.(2001), quando a estimativa</font> <font face="Verdana" size="2">de herdabilidade é feita com base em apenas um ano</font> <font face="Verdana" size="2">e um local, a variância genética sofre ação dos fatores</font> <font face="Verdana" size="2">de interações que possam estar presentes, e com isso</font> <font face="Verdana" size="2">ocorrer uma super estimativa da variância.</font> </p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">As estimativas de herdabilidades para GPD e</font> <font face="Verdana" size="2">GCD foram também relativamente altas com valores</font> <font face="Verdana" size="2">de 0,87 e 0,60 respectivamente. Esses dados foram</font> <font face="Verdana" size="2">similares aos encontrados por Wang, et al. (2006),</font> <font face="Verdana" size="2">que estimou herdabilidades para taxa de crescimento</font> <font face="Verdana" size="2">baseado no peso em híbridos de (Striped Bass), usando</font> <font face="Verdana" size="2">média de família e estas foram de 0,82 para matrizes</font> <font face="Verdana" size="2">e de 0,81 para reprodutores. Resultados similares</font> <font face="Verdana" size="2">foram obtidos com dados de taxa de comprimento. Já</font> <font face="Verdana" size="2">a estimativa para RC de 0,21, foi considerada media a</font> <font face="Verdana" size="2">baixa. Gjerde e Gjedrem (2003), observaram também</font> <font face="Verdana" size="2">valores considerados baixos para esta característica</font> <font face="Verdana" size="2">em salmão do Atlântico e truta Arco-Íris.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Segundo Falconer (1981), a estimação depende do</font> <font face="Verdana" size="2">método utilizado, número de indivíduos e forma de</font> <font face="Verdana" size="2">realização do experimento, o que poderia explicar</font> <font face="Verdana" size="2">parte das variações na estimação dos componentes.</font> <font face="Verdana" size="2">Os valores obtidos, portanto, podem fornecer uma</font> <font face="Verdana" size="2">resposta eficiente à seleção fenotípica, uma vez que</font> <font face="Verdana" size="2">grande parte da variação fenotípica é atribuída à</font> <font face="Verdana" size="2">variação genética entre indivíduos. Os resuldados de</font> <font face="Verdana" size="2">correlação genética e fenotípicas estão representados</font> <font face="Verdana" size="2">no <a href="#cuad2">Quadro 2</a>.</font></p>     <p ALIGN="center" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b><a name="cuad2">Quadro 2.</a></b><a name="cuad2"> </a>Correlação fenotípica (re) e genética (rp) para as variáveis analisadas em tilápia do Nilo (Oreochromis niloticus).</font></p>     <p ALIGN="center" style="word-spacing: 0; line-height: 100%"><img border="0" src="/img/fbpe/zt/v28n3/art10cuad2.jpg" align="center" width="374" height="153"></p>     
<p ALIGN="center" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">P 60: peso aos 60 dias de idade, C 60: comprimento aos 60 dias de idade, P 150: peso aos 150 dias de idade, C 150: comprimento aos 150 dias de idade, GPD: ganho de peso diário, GCD: ganho de comprimento diário e CE: carcaça eviscerada.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Neste trabalho, os efeitos de ambiente comum são</font> <font face="Verdana" size="2">resultados do fato dos peixes serem contemporâneos</font> <font face="Verdana" size="2">e criadas na mesma qualidade de água, bem como</font> <font face="Verdana" size="2">densidade e luz. As correlações genéticas e Fenotípicas</font> <font face="Verdana" size="2">entre (P60/P150;P60/C 60), (P150/C150) e (P150/CE)</font> <font face="Verdana" size="2">foram consideradas altas e sugere dada a magnitude</font> <font face="Verdana" size="2">das correlações genéticas entre as características, queos mesmos genes estão envolvidos na expressão das</font> <font face="Verdana" size="2">características, (Falconer e Mackay, 1996). De acordo</font> <font face="Verdana" size="2">com Cardellino e Rovira (1987), o grau de correlação</font> <font face="Verdana" size="2">genética entre duas características é importante</font> <font face="Verdana" size="2">para controlar diretamente a mudança genética</font> <font face="Verdana" size="2">da característica quando selecionada por meio de</font> <font face="Verdana" size="2">outra. As Correlações Genéticas de (P150/C150) de</font> <font face="Verdana" size="2">(1,00), concordam com Gjerde e Gjedrem, (2003),</font> <font face="Verdana" size="2">que observaram valor semelhante para o salmão</font> <font face="Verdana" size="2">do Atlântico e a truta Arco-Íris respectivamente,</font> <font face="Verdana" size="2">logo, o ganho genético proveniente da seleção para</font> <font face="Verdana" size="2">peso implicará em ganhos nestas características</font> <font face="Verdana" size="2">correlacionadas (Agostinho, 1988).</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">O valor estimado para (P60/ CE) foi baixos, não</font> <font face="Verdana" size="2">concordando com Gjerde e Gjedrem (2003), que</font> <font face="Verdana" size="2">estimou valores para peso corporal eviscerado e não</font> <font face="Verdana" size="2">eviscerados igual a 1,00 em salmão do Atlântico</font> <font face="Verdana" size="2">e truta Arco-Íris. Também Tave e Smitherman</font> <font face="Verdana" size="2">(1980), estimaram valores considerados altos para</font> <font face="Verdana" size="2">correlação genética acima de 0,9 entre 100 dias</font> <font face="Verdana" size="2">de idade e todas as idades acima de 115 dias para</font> <font face="Verdana" size="2">tilápia do Nilo. Entretanto, o valor (0,76) obtido para</font> <font face="Verdana" size="2">(P150 x CE) e 0,70 para (P60/C150), podem permitir</font> <font face="Verdana" size="2">ganhos genéticos alcançados por meio de seleção</font> <font face="Verdana" size="2">indireta. A contribuição das correlações genéticas</font> <font face="Verdana" size="2">levemente superiores à das correlações ambientais</font> <font face="Verdana" size="2">para a maioria das características estudadas, sugeri</font> <font face="Verdana" size="2">que peixes com alto peso quando juvenis podem</font> <font face="Verdana" size="2">apresentar características de peso e tamanho elevados</font> <font face="Verdana" size="2">em idades mais avançadas, tanto por causas genéticas</font> <font face="Verdana" size="2">como ambientais.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b>CONCLUSÕES</b></font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">As estimativas de herdabilidades para peso,</font> <font face="Verdana" size="2">comprimento, ganho de peso diário, carcaça</font> <font face="Verdana" size="2">eviscerada e ganho de comprimento diário obtidos</font> <font face="Verdana" size="2">para a tilápia do Nilo, indicam que as características</font> <font face="Verdana" size="2">estudadas são em grande parte controladas por genes</font> <font face="Verdana" size="2">com efeito aditivo, sendo possível obter ganhos</font> <font face="Verdana" size="2">genéticos por meio de seleção na espécie estudada. A</font> <font face="Verdana" size="2">correlação genética obtida para peso e comprimento,</font> <font face="Verdana" size="2">peso aos 60 dias, peso aos 150 dias, peso aos 150 dias</font> <font face="Verdana" size="2">e carcaça eviscerada nos permite praticar seleção</font> <font face="Verdana" size="2">para as características correlacionadas.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b>AGRADECIMENTOS</b></font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">Este trabalho foi financiado com fundos próprios</font> <font face="Verdana" size="2">concedidos pelo setor de ranicultura-UFV. Ao D.</font> <font face="Verdana" size="2">Pr. Oswaldo Pinto Ribeiro Filho e funcionários do</font> <font face="Verdana" size="2">Departamento de Biologia pelo especial apoio ao</font> <font face="Verdana" size="2">trabalho e a piscicultura João Salame pela doação de</font> <font face="Verdana" size="2">hipófises.</font></p>     <p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2"><b>LITERATURA CITADA</b></font></p>     <!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">1. Agostinho, C.A. 1988. Estimativa dos Parâmetros</font> <font face="Verdana" size="2">Genéticos e Fenotípicos de Características</font> <font face="Verdana" size="2">de Produção em Rã-Pimenta, (Leptodactylus</font> <font face="Verdana" size="2">labyrinthicus) (Spix, 1824). Universidade</font> <font face="Verdana" size="2">Federal de Viçosa (Tese Doutorado), p.139.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675835&pid=S0798-7269201000030001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">2. Anuário da Pecuária Brasileira. 2007. (ANUALPEC),</font> <font face="Verdana" size="2">pp. 287-289.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675836&pid=S0798-7269201000030001000002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-US">3. Bolivar, R.B. and G.F. Newkirk. 2002. Response to</span><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language:EN-US">within family selection for body weight in Nile</span><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><span lang="EN-US" style="font-size:10.0pt; font-family:Verdana;mso-ansi-language:EN-US">tilapia (Oreochromis niloticus) using a singletrait</span><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language:EN-US">animal model. </span><span style="font-size:10.0pt;font-family:Verdana">Aquaculture, 204: 371-381.</span><o:p> </o:p> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675837&pid=S0798-7269201000030001000003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">4. Cardellino, R. Y J. Rovira. 1987. Mejoramiento</font> <font face="Verdana" size="2">genetico animal. Montevideo, Hemiferio Sur.</font> <font face="Verdana" size="2">p. 253.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675838&pid=S0798-7269201000030001000004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">5. Carvalho, F. I. F., S. A. De Silva, A. J. Kurek e V.</font> <font face="Verdana" size="2">S. Marchiori. 2001. Estimativas e implicações</font> <font face="Verdana" size="2">da herdabilidade como estratégia de seleção.</font> <font face="Verdana" size="2">Pelotas: Ufpel, p. 98.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675839&pid=S0798-7269201000030001000005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">6. CEDAP. 2003. Aqüicultura de Santa Catarina - dados</font> <font face="Verdana" size="2">de produção. Santa Catarina: CEDAP, 2003,</font> <font face="Verdana" size="2">p. 18.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675840&pid=S0798-7269201000030001000006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><span lang="EN-US" style="font-size:10.0pt;font-family: Verdana;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA">7. Charo-Karis, H., H. Bovenhuis, M.A. Rezk, R.W.</span><span lang="EN-US" style="font-size:12.0pt; font-family:&quot;Times New Roman&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-fareast-font-family: &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-ansi-language: EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA">Ponzoni, A.M. Arendonk, J. and H. Komen.</span><span lang="EN-US" style="font-size:12.0pt;font-family: &quot;Times New Roman&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-language: EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-fareast-font-family: &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-ansi-language: EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA">2007. Phenotypic and genetic parameters for</span><span lang="EN-US" style="font-size:12.0pt; font-family:&quot;Times New Roman&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-fareast-font-family: &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-ansi-language: EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA">body measurements, reproductive traits and gut</span><span lang="EN-US" style="font-size:12.0pt; font-family:&quot;Times New Roman&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-fareast-font-family: &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-ansi-language: EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA">length of Nile tilapia (Oreochromis niloticus)</span><span lang="EN-US" style="font-size:12.0pt; font-family:&quot;Times New Roman&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-fareast-font-family: &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-ansi-language: EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA">selected for growth in low-input earthen ponds.</span><span lang="EN-US" style="font-size:12.0pt; font-family:&quot;Times New Roman&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-fareast-font-family: &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-ansi-language: EN-US;mso-fareast-language:ES;mso-bidi-language:AR-SA">Aquaculture. 273:115-23.</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675841&pid=S0798-7269201000030001000007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">8. Falconer, D. S. 1981.</font> <font face="Verdana" size="2">Intrucão à genetica quantitativa trad. Silva, M.</font> <font face="Verdana" size="2">A., Silva, J. C., Viçosa M. G.; UFV. Impr. Uni.</font> <font face="Verdana" size="2">p. 279.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675842&pid=S0798-7269201000030001000008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">9. Falconer, D. S. and T. F. C. Mackay. 1996. Introduction</font> <font face="Verdana" size="2">to quantitative genetics. 4 th ed., Longman,</font> <font face="Verdana" size="2">Malaysia. p. 446.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675843&pid=S0798-7269201000030001000009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><span style="font-size:10.0pt;font-family:Verdana">10. Falconer, D.S. 1993. </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language:EN-US">Quantitative genetics in</span><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language:EN-US">Edinburgh: 1947-1980. </span><span style="font-size:10.0pt;font-family:Verdana">Genetics 133(1): 137-142</span><u1:p> </u1:p> <o:p> </o:p> .&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675844&pid=S0798-7269201000030001000010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><span style="font-size:10.0pt;font-family:Verdana; mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:ES;mso-fareast-language:ES;mso-bidi-language:AR-SA">11. Faria, R.H.S., L.R. Souza y M.E.R. Pereira. 2003.</span><span style="font-size: 12.0pt;font-family:&quot;Times New Roman&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;; mso-ansi-language:ES;mso-fareast-language:ES;mso-bidi-language:AR-SA"> </span><span style="font-size:10.0pt;font-family:Verdana;mso-fareast-font-family:&quot;Times New Roman&quot;; mso-bidi-font-family:&quot;Times New Roman&quot;;mso-ansi-language:ES;mso-fareast-language: ES;mso-bidi-language:AR-SA">Avaliação de diferentes posições de marcação</span><span style="font-size:12.0pt;font-family:&quot;Times New Roman&quot;;mso-fareast-font-family: &quot;Times New Roman&quot;;mso-ansi-language:ES;mso-fareast-language:ES;mso-bidi-language: AR-SA"> </span><span style="font-size:10.0pt;font-family:Verdana;mso-fareast-font-family: &quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;;mso-ansi-language: ES;mso-fareast-language:ES;mso-bidi-language:AR-SA">externa em juvenis de tilápia (Oreochromis</span><span style="font-size:12.0pt;font-family:&quot;Times New Roman&quot;; mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-language:ES;mso-fareast-language: ES;mso-bidi-language:AR-SA"> </span><span style="font-size:10.0pt;font-family: Verdana;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:ES;mso-fareast-language:ES;mso-bidi-language:AR-SA">niloticus; Cichlidae). Acta Scientiarum.</span><span style="font-size:12.0pt;font-family: &quot;Times New Roman&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-language: ES;mso-fareast-language:ES;mso-bidi-language:AR-SA"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-fareast-font-family:&quot;Times New Roman&quot;; mso-bidi-font-family:&quot;Times New Roman&quot;;mso-ansi-language:EN-US;mso-fareast-language: ES;mso-bidi-language:AR-SA">25(1): 273-276.</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675845&pid=S0798-7269201000030001000011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">12. Gjerde B. and T. Gjedrem. 2003. Estimates of</font> <font face="Verdana" size="2">phenotypic and genetic parameters for carcass</font> <font face="Verdana" size="2">trais in Atlantic salmon and rainbow trout.</font> <font face="Verdana" size="2">Aquaculture. 36: 97-110.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675846&pid=S0798-7269201000030001000012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">13. Graeff Á. e E. N. Pruner. 2006. Variáveis que podem</font> <font face="Verdana" size="2">interferir na sobrevivência e desenvolvimento</font> <font face="Verdana" size="2">da Tilapia nilotica (Oreochromis niloticus) na</font> <font face="Verdana" size="2">região fria do Estado de Santa Catarina. CIVA</font> <font face="Verdana" size="2">2006 (http://www.civa2006.org). pp. 70-79.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675847&pid=S0798-7269201000030001000013&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">14. Kubitza, F. (2000). Tilápia: tecnologia e planejamento</font> <font face="Verdana" size="2">na produção comercial. 1º. ed. Jundiaí: F.</font> <font face="Verdana" size="2">Kubitza. p. 285.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675848&pid=S0798-7269201000030001000014&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">15</font>. <font face="Verdana" size="2">Maluwa, A.O. and B. Gjerde. 2006. Estimates of</font> <font face="Verdana" size="2">the strain additive, maternal, and heterosis</font> <font face="Verdana" size="2">genetic effects for harvest body weight of</font> <font face="Verdana" size="2">an F2 generation of Oreochromis shiranus.</font> <font face="Verdana" size="2">Aquaculture 259:38–46.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675849&pid=S0798-7269201000030001000015&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-US">16. McKay., L.R., G.W. Friars and P.E. Ihssen. 1984.</span><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language:EN-US">Genotype × temperature interactions for growth</span><span lang="EN-US" style="mso-ansi-language: EN-US"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana; mso-ansi-language:EN-US">of rainbow trout. Aquaculture 41:131-140.</span><span lang="EN-US" style="mso-ansi-language:EN-US"><o:p> </o:p> </span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675850&pid=S0798-7269201000030001000016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p style="word-spacing: 0in"><span style="font-size:10.0pt;font-family:Verdana">17. Neira R., N.F. Díaz, A.E. Gall, G.J.A. Gallardo,</span> <span style="font-size:10.0pt;font-family:Verdana">J.P. 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Aquaculture.</span><span lang="EN-US" style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:Arial;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family: &quot;Times New Roman&quot;;color:red;mso-ansi-language:EN-US;mso-fareast-language:ES; mso-bidi-language:AR-SA"> </span><span lang="EN-US" style="font-size:10.0pt; font-family:Verdana;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family: &quot;Times New Roman&quot;;mso-ansi-language:EN-US;mso-fareast-language:ES;mso-bidi-language: AR-SA">In</span><span lang="EN-US" style="font-size:12.0pt;font-family:&quot;Times New Roman&quot;; mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-language:EN-US;mso-fareast-language: ES;mso-bidi-language:AR-SA"> </span><span lang="EN-US" style="font-size:10.0pt; font-family:Verdana;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family: &quot;Times New Roman&quot;;mso-ansi-language:EN-US;mso-fareast-language:ES;mso-bidi-language: AR-SA">press. </span><span lang="FR" style="font-size:10.0pt;font-family:Verdana; mso-fareast-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:FR;mso-fareast-language:ES;mso-bidi-language:AR-SA">Doi: AQUA-629132.</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675853&pid=S0798-7269201000030001000019&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-US">20. 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Genetic parameters and</span><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language:EN-US">response to selection for live weight in the GIFT</span><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><span lang="EN-US" style="font-size:10.0pt; font-family:Verdana;mso-ansi-language:EN-US">strain of Nile tilapia (Oreochromis niloticus).</span><span lang="EN-US" style="mso-ansi-language:EN-US"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:Verdana;mso-ansi-language: EN-US">Aquaculture. 247:203-210.</span><span lang="EN-US" style="mso-ansi-language: EN-US"><o:p> </o:p> </span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2675854&pid=S0798-7269201000030001000020&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify" style="word-spacing: 0; line-height: 100%"><font face="Verdana" size="2">21. 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