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Journal of Applied Genetics

, Volume 56, Issue 2, pp 219–229 | Cite as

Multi-trait linear reaction norm model to describe the pattern of phenotypic expression of some economic traits in beef cattle across a range of environments

  • Mário Luiz SantanaJr.Email author
  • Joanir Pereira Eler
  • Annaiza Braga Bignardi
  • Alberto Menéndez-Buxadera
  • Fernando Flores Cardoso
  • José Bento Sterman Ferraz
Animal Genetics • Original Paper

Abstract

The multi-trait reaction norm (MTRN) model was extended to beef cattle reared under tropical conditions with the following objectives: to compare multi-trait (MT) and MTRN models regarding the genetic parameters obtained; and to characterize G × E, the pattern of phenotypic expression, and the environmental sensitivity of animals for postweaning weight gain (PWG), scrotal circumference (SC), and annual average productivity of the cow (PRODAM). There was divergence in the estimates between the MT and MTRN models when the posterior probability intervals of additive genetic variances and heritability coefficients of PWG and PRODAM were analyzed. The MTRN model indicated an increase in heritability for PWG and PRODAM with improvement of the environmental conditions. For SC, heritability was practically the same, irrespective of the environmental conditions. The genetic correlations between the traits studied were low but varied over environments by the MTRN model. Considering genetic correlations obtained by the MTRN model for the same trait, lower estimates were obtained between extreme favorable and unfavorable environments. This finding suggest re-ranking of breeding values in different environments mainly for PWG and PRODAM. Thus, G × E is more important for PWG and PRODAM than for SC and should be included in the genetic evaluation of these traits. The traits PWG and PRODAM can be considered plastic traits, whereas SC is poorly plastic. The genetic trends in individual animal slopes indicate that the population is moving towards greater plasticity. This could be a matter of concern for breeders since greater plasticity seems to limit heritability and, consequently, the responses to selection.

Keywords

Genetic parameter Genotype by environment interaction Nelore Plasticity Productive life Tropical conditions 

Notes

Acknowledgments

We are grateful to CFM-Leachman Pecuária Ltda. for providing the data set. This work was funded by Fundação de Amparo à Pesquisa do Estado de Mato Grosso (FAPEMAT).

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Copyright information

© Institute of Plant Genetics, Polish Academy of Sciences, Poznan 2014

Authors and Affiliations

  • Mário Luiz SantanaJr.
    • 1
    Email author
  • Joanir Pereira Eler
    • 2
  • Annaiza Braga Bignardi
    • 1
  • Alberto Menéndez-Buxadera
    • 3
  • Fernando Flores Cardoso
    • 4
  • José Bento Sterman Ferraz
    • 2
  1. 1.Grupo de Melhoramento Animal de Mato Grosso (GMAT), Instituto de Ciências Agrárias e TecnológicasUniversidade Federal de Mato GrossoRondonópolisBrazil
  2. 2.Grupo de Melhoramento Animal e Biotecnologia (GMAB), Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de AlimentosUniversidade de São PauloPirassunungaBrazil
  3. 3.Departamento de Genética, Grupo Meragen, RabanalesUniversidad de CórdobaCordobaSpain
  4. 4.Embrapa Pecuária SulBagéBrazil

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