Reaction norms in weights at 365 days old in nellore bulls in northern Brazil

Authors

  • Jorge Luís Ferreira Universidade Federal do Tocantins
  • Alliny Souza de Assis Universidade Federal de Goiás, Escola de Veterinária e Zootecnia
  • Fernando Brito Lopes University of Wisconsin
  • Thomas Wayne Murphy University of Wisconsin
  • Marcelo Corrêa da Silva Universidade Federal de Goiás,Escola de Veterinária e Zootecnia
  • José Américo Soares Garcia Faculdade de Agronomia e Veterinária, Universidade de Brasilia
  • Ednira Gleida Marques Associação Brasileira dos Criadores de Zebu

DOI:

https://doi.org/10.5433/1679-0359.2015v36n6Supl2p4613

Keywords:

Animal breeding, Growth, Random regression.

Abstract

Genotype by environment interaction (GxE) studies are of particular interest in Brazil because of the regional diversity of environmental effects and the wide variety of management systems. The present study evaluates GxE effects on 365 d weight (365W) of Nellore cattle raised on pasture in northern Brazil. The analysis utilized random regression techniques to model the reaction norm. Fixed effects consisted of sex, contemporary group, and the covariate of age of cow at calving. The environmental gradient, defined by the concatenation of a bull and the state in which the calf was born, was modeled by second order Legendre polynomials. Direct additive genetic and residual effects were fit as random. Results showed differences in the magnitude of expression of genotype in proportion to decreasing favorability of the environment. As the environment became more unfavorable, the correlation of breeding value to different environments decreased. The correlations between the intercept and the level slope for 365W feature were of moderate magnitude, predominantly indicating the reclassification of sires in different environments. Reaction standard model was coherent from a technical and biological view point and enabled the perception of GxE in the genetic evaluation of Nellore cattle in the states of Maranhão, Pará and Tocantins.

 

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Author Biographies

Jorge Luís Ferreira, Universidade Federal do Tocantins

Prof. Dr., Universidade Federal do Tocantins, UFT, Campus de Araguaína, Araguaína,TO, Brasil. 

Alliny Souza de Assis, Universidade Federal de Goiás, Escola de Veterinária e Zootecnia

Médica Veterinária, Discente do Curso de Mestrado do Programa de Pós-Graduação em Ciência Animal, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, UFG, Campus Samambaia, Goiânia, GO, Brasil. 

Fernando Brito Lopes, University of Wisconsin

Post-Doctoral, Department of Animal Sciences, University of Wisconsin, Madison, Wisconsin, USA. 

Thomas Wayne Murphy, University of Wisconsin

Ph.D., Department of Animal Sciences, University of Wisconsin, Madison, Wisconsin, USA. 

Marcelo Corrêa da Silva, Universidade Federal de Goiás,Escola de Veterinária e Zootecnia

Médico Veterinário, Discente do Curso de Doutorado do Programa de Pós-Graduação em Ciência Animal, Escola de Veterinária e Zootecnia, UFG, Campus Samambaia, Goiânia, GO, Brasil. 

José Américo Soares Garcia, Faculdade de Agronomia e Veterinária, Universidade de Brasilia

Prof. Associado I, Faculdade de Agronomia e Veterinária, Campus Darcy Ribeiro, Universidade de Brasília, UNB, Brasília, DF, Brasil.

 

Ednira Gleida Marques, Associação Brasileira dos Criadores de Zebu

Zootecnista, M.e, Associação Brasileira de Criadores de Zebu, ABCZ, Uberaba, MG, Brasil.

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Published

2015-12-16

How to Cite

Ferreira, J. L., Assis, A. S. de, Lopes, F. B., Murphy, T. W., Silva, M. C. da, Garcia, J. A. S., & Marques, E. G. (2015). Reaction norms in weights at 365 days old in nellore bulls in northern Brazil. Semina: Ciências Agrárias, 36(6Supl2), 4613–4626. https://doi.org/10.5433/1679-0359.2015v36n6Supl2p4613

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