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Estimates of genetic parameters for weights between 60 and 600 days of age for Brahman Cattle Using Random Regression Models
Estimates of genetic parameters for weights between 60 and 600 days of age for Brahman Cattle Using Random Regression Models
Monday, August 18, 2014
Posters (The Westin Bayshore)
Abstract Text: Genetic parameters were estimated through random regression models to 78,641 records in weight between 60 and 600 days of age. We used 16,298 animals of Brahman cattle raised in Brazil. The models included the fixed effects of contemporary group, additive genetic direct and maternal genetic; and permanent environmental of the animal beyond the covariate age at calving (quadratic) nested with class of the animal's age. Heterogeneous model with 5 classes was we the best fitted the residual variances being considered orthogonal Legendre polynomials of cubic order. The direct heritability varied from 0.42 to 0.79 for 60 and 600 days of age, respectively. The maternal heritability with higher magnitude of was observed for 140 days of age (0.08). Genetic correlations were generally moderate to high magnitudes. Highest efficiency in the selection can be obtained considering the weight near to 100 days of age.
Keywords:
genetic correlation
heritability
selection
