Interação genótipo x ambiente sobre características produtivas e reprodutivas de fêmeas Nelore

Abstract

Genetic parameters were estimated and the genotype x environment interaction was evaluated for weight adjusted for 420 days old, age at first calving and first calving interval, in females of the Nelore raised in three regions in the state of Mato Grosso do Sul. The statistical model contained the genetic effects and direct additive (random effects) and residual, as fixed, the effects of farm and contemporary group. Analyses were performed with univariate and bivariate animal model. Heritability estimates were 0.41; 0.16; 0.09; for W420, AFC and FCI, respectively. When was utilized the Spearman correlation to compare the variation in the ordering of the expected progeny differences, there was noted the change in classification of the sires from region to region. These results show evidence of genotype by environment interaction for the traits studied, with possibility of breeders selected as top genetic merit for a region not be for others.