pre-weaning performance evaluation of a multibreed aberdeen angus × nellore population using different genetic models avaliação do desempenho na pré desmama de uma população bovina multirracial aberdeen angus × nelore utilizando diferentes modelos genéticos

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ID: 207872
2010
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Abstract
This work aimed at estimating the genetic effects that affect the pre-weaning performance of animals from multibreed crosses. In order to do so, it was used information of the weight at weaning of 79,521 animals, sired by 1,020 bulls and 61,898 cows from Aberdeen Angus and Nellore breeds and from many genetic groups resulted from their crosses. Five genetic models were tested: model 1, containing the fixed breed genetic effects (additive direct and maternal effects, heterozygote direct and maternal effects, epystatic direct and maternal effects, joint additive direct and maternal effects); model 2, equal to model 1, excluding direct and maternal joint additive effects; model 3, equal to model 1, excluding direct and maternal epystatic effects; model 4, equal to model 1, excluding direct and maternal epystactic effect and direct and maternal joint additive effects; and model 5, equal to model 1, excluding direct and maternal heterozygotic effects, direct and maternal epystatic effects and direct and maternal joint additive effects. The models were analyzed by the following methods: least square means method, ridge regression method, and the restricted maximum likelihood method. The dominant additive models usually used for genetic evaluations do not give a good description of the pre-weaning performance variations, making it necessary to add the heterozygote and epystatic effects; the joint additive effects do not significantly improve the adjustment of the analysis model and the heterozygote effects are efficient in representing a quadratic breed additive effect, in addition to insert an unnecessary bias assigned to multicollinearity related to the joint additive effects.
Com o objetivo de estimar os efeitos genéticos que influenciam o desempenho pré-desmama de animais produtos de cruzamentos multirraciais, foram utilizadas informações do peso a desmama de 79.521 bezerros, filhos de 1.020 touros e 61.898 vacas das raças Aberdeen Angus e Nelore e de diversos grupos genéticos resultantes do cruzamento entre elas. Foram testados cinco modelos genéticos: o modelo 1, contendo os efeitos genéticos de raça fixos (aditivos diretos e maternos, heterozigóticos diretos e maternos, epistáticos diretos e maternos e aditivos conjuntos diretos e maternos); o modelo 2, igual ao modelo 1, porém sem os efeitos aditivos conjuntos diretos e maternos; o modelo 3, igual ao modelo 1, porém sem os efeitos epistáticos diretos e maternos; o modelo 4, igual ao modelo 1, sem os efeitos epistáticos diretos e maternos e os aditivos conjuntos diretos e maternos; e o modelo 5, igual ao modelo 1, sem os efeitos heterozigóticos diretos e maternos, espistáticos diretos e maternos e aditivos conjuntos diretos e maternos. Os modelos foram analisados pelos métodos dos quadrados mínimos, de regressão de cumeeira e de máxima verossimilhança restrita. Os modelos aditivo-dominantes, usualmente utilizados em avaliações genéticas, não descrevem adequadamente as variações no desempenho pré-desmama, devendo ser adicionados os efeitos heterozigóticos e epistáticos; os efeitos aditivos conjuntos não melhoram significativamente os ajustes dos modelos de análise e os efeitos heterozigóticos são eficientes para representar um efeito quadrático aditivo de raça, além de inserirem um viés desnecessário atribuído a multicolineariedade relacionada aos efeitos aditivos conjuntos.
Reference Key
lopes2010revistapre-weaning Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Jader Silva Lopes;Paulo Roberto Nogara Rorato;Tomás Weber;Ronyere Olegário de Araújo;Mariana de Almeida Dornelles;Juliana Grigolleto Comin
Journal european journal of lipid science and technology
Year 2010
DOI
10.1590/S1516-35982010001100014
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100014
Keywords
heterozygous epistasis multicollinearity

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