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Multiple-breed reaction norm animal model accounting for robustness and heteroskedastic in a Nelore–Angus crossed population

Published online by Cambridge University Press:  12 January 2016

M. M. Oliveira ,
M. L. Santana  and
F. F. Cardoso
M. M. Oliveira
Affiliation:
Universidade Federal de Pelotas (UFPEL), Pelotas, RS, Brazil
M. L. Santana
Affiliation:
Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e Tecnológicas, Universidade Federal de Mato Grosso, Campus Universitário de Rondonópolis, MT-270, Km 06, CEP 78735-901, Rondonópolis, MT, Brazil
F. F. Cardoso*
Affiliation:
Universidade Federal de Pelotas (UFPEL), Pelotas, RS, Brazil Embrapa Pecuária Sul, C. Postal 242-BR 153-Km 633, CEP 96.401-970, Bagé, RS, Brazil. Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brasília, Brazil
*
†E-mail: [email protected]
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Abstract

Our objective was to genetically characterize post-weaning weight gain (PWG), over a 345-day period after weaning, of Brangus-Ibagé (Nelore×Angus) cattle. Records (n=4016) were from the foundation herd of the Embrapa South Livestock Center. A Bayesian approach was used to assess genotype by environment (G×E) interaction and to identify a suitable model for the estimation of genetic parameters and use in genetic evaluation. A robust and heteroscedastic reaction norm multiple-breed animal model was proposed. The model accounted for heterogeneity of residual variance associated with effects of breed, heterozygosity, sex and contemporary group; and was robust with respect to outliers. Additive genetic effects were modeled for the intercept and slope of a reaction norm to changes in the environmental gradient. Inference was based on Monte Carlo Markov Chain of 110 000 cycles, after 10 000 cycles of burn-in. Bayesian model choice criteria indicated the proposed model was superior to simpler sub-models that did not account for G×E interaction, multiple-breed structure, robustness and heteroscedasticity. We conclude that, for the Brangus-Ibagé population, these factors should be jointly accounted for in genetic evaluation of PWG. Heritability estimates increased proportionally with improvement in the environmental conditions gradient. Therefore, an increased proportion of differences in performance among animals were explained by genetic factors rather than environmental factors as rearing conditions improved. As a consequence response to selection may be increased in favorable environments.

Keywords

beef cattlegenotype×environment interactiongenetic parametersplasticitygrowth
Type
Research Article
Information
animal , Volume 10 , Issue 7 , July 2016 , pp. 1093 - 1100
Copyright
© The Animal Consortium 2016 

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