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It was conducted a genetic analysis of prolificacy and survival of the Merina breed lambs from birth to end of fattening. Univariate analysis, with a threshold model for prolificacy, and an animal model with REML methodology, for survival at the end of fattening, was performed. The estimation of genetic parameters determined a prolificacy heritability (h2) equal to 0.115 (0.166 and 0.171 for direct genetic effects and maternal effects, respectively) and equal to 0.072 for postnatal survival (0.176 for direct genetic effects and 0.040 for maternal effects). Additionally, the genetic correlation between the two traits was -0.044 and -0.201, for direct and maternal genetic effects. These h2 are high enough to ensure a positive response to selection for both prolificacy and survival until the end of fattening. However, given the negative genetic correlation between the two types of traits, selection for improved prolificacy should be accompanied both for environmental and genetic improvement of the lambs survival capacity, if you do not want to penalize the lambs weight growth born with increased mortality.

Parámetros genéticos de la prolificidad y la supervivencia hasta el sacrificio en corderos de raza Merina