Resumo

BOLIVAR VERGARA, Diana María et al. GENETIC PARAMETERS FOR REPRODUCTIVE TRAITS IN A POPULATION OF BUFFALOES (BUBALUS BUBALIS ARTIODACTYLA: BOVIDAE) IN THE MIDDLE MAGDALENA REGION OF COLOMBIA. Rev. Fac. Nac. Agron. Medellín [online]. 2010, vol.63, n.2, pp.5587-5594. ISSN 0304-2847.

The research was carried out to estimate (co)variance components and genetic parameters for age at first calving (AFC) and calving interval (CI) in a population of buffaloes located in Middle Magdalena region of Colombia. The traits evaluated were AFC, CI between first and second calving (CI_1-2), CI between second and third calving (CI_2-3) and CI between third and fourth calving(CI_3-4), using animal model multitrait. A single-trait animal model was used for IEP considering all calving (CItotal). Estimative of (co)variance components were obtained by the method of derivative free restricted maximum likelihood. Estimates of heritability were 0.42, 0.11, 0.07, 0.31, and 0.05 ± 0.061 for AFC, CI_1-2, CI_2-3, CI_3-4, and CItotal, respectively. The heritability found for AFC, suggest that selection for these traits is feasible in this population. The heritability for CItotal indicates that this trait is strongly influenced by environmental and non-additives genetic factors. Genetic correlations among different IEP were high and positive. Genetic correlations between AFC and the IEP varied widely.

Palavras-chave : Heritability; (co)variance components; genetic correlations.

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