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Revista de la Facultad de Ciencias Veterinarias
versión impresa ISSN 0258-6576
Resumen
VERGARA, Oscar D et al. Parameters and Genetic Trends for Preweaning Growth Traits in a Multibreed Cattle Population in Colombia. Rev. Fac. Cienc. Vet. [online]. 2014, vol.55, n.2, pp.68-77. ISSN 0258-6576.
The aim of this study was to estimate heritabilities, correlations, heterosis, and genetic trends for birth weight (BW) and adjusted weight at weaning (AWW, 270 d) in a multibreed Angus × Brahman population in the Colombian tropical lowlands. A total of 561 records of BW and weaning weight from 1999 to 2010 were used. Data were analyzed using a bivariate model, which included the fixed effects of contemporary group (year-season of birth-sex), age of mother, direct genetic effects and maternal effects of breed, individual and maternal heterosis; and the direct and maternal genetic random effects of the animal, maternal permanent environment, and residuals. Variance components were estimated by the restricted maximum likelihood method, using the AIREML program. Estimates of direct heritability for BW and AWW were 0.08 ± 0.005 and 0.10 ± 0.006, respectively. The maternal heritability for BW was 0.04 ± 0.002 and 0.08 ± 0.005 for AWW. Negative genetic correlations were found between direct and maternal effects for BW (-0.51 ± 0.02) and AWW (-0.21 ± 0.03), and between direct effects for BW and maternal for AWW (-0.50 ± 0.02). The genetic trends for direct and maternal effects were closed to zero and not statistically significant (P>0.05). The direct and maternal heritabilities for both traits suggest that nutrition conditions and management should be improved and homogenize in the population to improve animal growth in the pre-weaning phase. Genetic trends indicate that the selection intensity applied to this multiracial population was not enough to exert an influence on the direct breeding and maternal values during the years of the study.
Palabras clave : Genetic inheritance; genetic correlation; weaning weight; birth weight; animal breeding; livestock breeds; Colombia.