Índices de selección para la mejora genética de vacas Siboney de Cuba

Phenotypic and genealogy date of Siboney de Cuba cows from 1984 to 2016 calving years was used. The goal of this study was to estimate the parameters and breeding values (VG) of production, reproduction and longevity traits. Besides to construct selection index (IS) using principal componente (CP) analysis. The VG of 6 425 cows were estimated for milk yield up to 305 days (VGL305), lactation length (VGDL), age at first calving (VGEP1), calving gestation interval (VGIPG), lifetime yields (VGLTV) y productive life (VGVP). The heredabilities for L305, DL, EP1, IPG, LTV y VP were of 0.16±0.01, 0.04±0.01, 0.04±0.01, 0.44±0.02, 0.05±0.01 y 0.01±0.01, respectively. The genetic correlation between L305 and DL was of 0.36, between EP1, IPG and LTV of 0.36, -0.42 and -0.36, and the VP with the others traits were low (-0.24 to 0.11). The 70.8 % of the total variance of VG was explained for the CP1-3, doing the highest importance the CP1 (32.4 %). Using CP, it is possible to select animals based on only two scores generated by PC1 and PC2 instead of the six VG. It was concluded that it is possible to construct IS based on CP in Siboney de Cuba bovine. Selection for VGL305 and VGDL with PC1 index could be done separately from selection for VGIPG, VGEP1 and VGLTV using PC2 index, and the VP could be improved independent of the other traits using their VG.