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Revista Brasileira de Zootecnia

On-line version ISSN 1806-9290

Abstract

TORAL, Fábio Luiz Buranelo; TORRES JUNIOR, Roberto Augusto de Almeida; LOPES, Paulo Sávio  and  SILVA, Luiz Otávio Campos da. Modeling of genetic and environmental effects affecting the weaning weight of Charolais-Zebu crossbred calves. R. Bras. Zootec. [online]. 2011, vol.40, n.11, pp.2378-2387. ISSN 1806-9290.  http://dx.doi.org/10.1590/S1516-35982011001100014.

This study was carried out to evaluate some alternatives for modeling of genetic and environmental effects influencing the weaning weight of Charolais-Zebu crossbred calves. The weaning weight data of 56,965 calves with alleles' percentage from the Charolais breed varying from 23% to 66% were used. The models under comparison differed for the inclusion of the individual and maternal additive and non-additive genetic effects, as well as the way to model those effects (multiple regression or discrete variable). The inclusion of the interaction between the calf genetic group and its contemporary group was also evaluated as a random uncorrelated effect. The adjustment criteria pointed out the interaction between the calf genetic group and its contemporary group to represent a significant part of the variation observed for the weaning weight of the Charolais-Zebu crossbred calves, and the effects of alleles' percentage from the Charolais breed and the heterozygosity, individual and maternal, can be modeled by using the multiple regression.

Keywords : beef cattle; crossbreeding; heterozygosis; multiple-breed genetic evaluation; statistical model.

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