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Volume 57, issue 1
Arch. Anim. Breed., 57, 32, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Arch. Anim. Breed., 57, 32, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Nov 2014

14 Nov 2014

Reaction norms of direct and maternal effects for weight at 205 days in Polled Nellore cattle in north-eastern Brazil

Diego Pagung Ambrosini1, Carlos Henrique Mendes Malhado1, José Braccini Neto2, Raimundo Martins Filho3, Paulo Roberto Antunes de Mello Affonso1, and Paulo Luiz Souza Carneiro1 Diego Pagung Ambrosini et al.
  • 1Universidade Estadual do Sudoeste da Bahia, Brazil
  • 2Universidade Federal do Rio Grande do Sul, Brazil
  • 3Universidade Federal do Ceará, Brazil

Abstract. This study investigated the presence of genotype-environment interaction (GEI) for body weight adjusted to 205 days of age (W205) in Polled Nellore cattle raised in north-eastern Brazil using reaction norm (RN) models. The reaction norm hierarchical models (RNHM) included the fixed (linear and quadratic) effect of cow’s age, random effect of contemporary group (CG), RN level and slope for additive direct and maternal genetic effects and permanent maternal environmental effect. The one-step reaction norm model with homogeneous residual variance (RNHM1sHm) yielded the best adjustment compared to the others. Based on this model, the estimates of direct additive and maternal variances and increased with environment improvement (35.34±7.92 kg2 to 134.42±25.97 kg2 and 12.76±5.38 kg2 to 58.22±19.74 kg2 for low and high-quality environments, respectively). The estimates of heritability direct additive and maternal too increased with environmental improvement (0.08±0.02 to 0.24±0.04 and 0.03±0.01 to 0.10±0.04). The correlation between the intercept and the slope of RNHM indicates that animals with higher genetic values respond more efficiently to environmental improvements, representing a scale effect for W205. These results allowed us to characterize the GEI for W205 and showed that specific evaluation should be performed with low, intermediary and high production levels.