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• W638864557 abstract "Variance components and genetic parameters were estimated for birthweight (n=2905), weaning weight adjusted to 205 d (n=2264), and preweaning daily gain (n=2264) in four herds of Brahman cattle in southeastern Mexico. Six animal models were fitted for each trait, ranging from a simple model, with the additive direct effect (o2a) as the only random effect, to the complete model with o2a, additive maternal effect (o2m), covariance between them (oam) and maternal permanent environmental effect (o2c). The six models included as fixed effects contemporary group of birth (herd-year-season), sex and parity number. The likelihood ratio test proved that for all traits o2m and o2am were important (P 0.05). Ignoring maternal effects in the models tended to increase direct heritability, while ignoring oam tended to increase error. Elimination of o2c did not affect direct and maternal heritability estimates. Spearman correlations of direct and of maternal animal genetic values, between models with and without o2c were 1, suggesting no differences in the ranking of animals. The genetic correlations between additive and maternal heritabilities for all characteristics were negative, which affected estimated total heritability (lower than in models omitting oam). The additive genetic variance, given maternal effects (o2a.m), was constant across models suggesting a correct partition of additive genetic effects into their direct and maternal components. In conclusion, the most appropriate model must be selected for each characteristic, in order to reduce bias in genetic evaluation." @default.
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• W638864557 date "2008-01-01" @default.
• W638864557 modified "2023-09-23" @default.
• W638864557 title "Comparación de modelos en la evaluación genética de caracteres de crecimiento del ganado Brahman en el sureste de México" @default.
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