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Genetic and phenotype relationship between reproductive traits and milk yield in Caracu cattle: III. Genetic and phenotypic relationship between milk production and reproduction: Estimates of expected transmitting abilities of sires for milk yield



Genetic and phenotype relationship between reproductive traits and milk yield in Caracu cattle: III. Genetic and phenotypic relationship between milk production and reproduction: Estimates of expected transmitting abilities of sires for milk yield



Arquivo Brasileiro de Medicina Veterinaria e Zootecnia 46(2): 171-184



Records of reproduction and milk production of Caracu cows were analyzed, and the following traits were considered: age at first (AFC) and second calvings (ASC), first, second and third calving intervals (CI-1, CI-2, CI-3) and milk yields for the first three lactations (MY1, MY2, MY3). The genetic analysis were carried out through the procedure available in the Least-squares and Maximum Likelihood (HARVEY, 1982). Only sires with 3 ou more daughters were considered in the analysis. Genetic correlations between AFC and ASC was 0.90+-0.06, which implies that both traits are essentially the same trait genetically. The genetic, phenotypic and environmental correlations between AFC and MY1 were: 0.14+-0.13, 0.13 and 0.12, implying that both traits are genetically independent. For the first three milk yields and corresponding first three calving intervals, the genetic, phenotypic and environmental correlations were: MY1 and CI-1, 0.51+-0.17, 0.20 and 0.13; MY 2 and CI-2, 1.01+-0.48, 0.20 and 0.13; MY3 and CI-3, 0.31+-0.54, 0.20 and 0.19. These results suggest a substantial antagonism between milk production and calving interval. Estimations of expected transmitting abilities of 177 sires were obtained using the BLUP procedures.

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