Resumo

VERDE, Omar. Beef Cattle Production System at La Cumaca Experimental Station II.- Weaning Weight. Rev. Fac. Cienc. Vet. [online]. 2007, vol.48, n.2, pp.105-110. ISSN 0258-6576.

In this second article, the character adjusted to age  205 days, was the evaluated in a registered Brahman herd located at La Cumaca Alí Benavides Zapata Experimental Station, in State of Yaracuy, Venezuela. A total of 4715 weights measured at 205 days were analized using  mixed models techniques (including an Animal Model). The following variables were studied: sex, year and month of birth, age of dam, and sire and dam effects. The results of the present investigation show overall average weight of 158.6 ± 0.76  kg. All effects were significant (p<0.01), yielding an annual phenotipic trend of 100 g, a direct genetic trend of  236 g, and a maternal trend one of 178g, correspondingly. The direct and maternal heritability indexes were 0.11 and 0.24, respectively. Cows produced heavier calves from first to fourth parturition, declining from there

Palavras-chave : Beef cattle; Brahman; animal husbandry methods; weaning weight; sex; animal models; Yaracuy.

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