Genetic evaluation of multibreed populations of milking bovines
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Abstract
milk production, up to 305 days (L305), from three Cuban genetic
enterprises and between 1984 and 2013, were used. Out of a total
of 61,471 cows, 12,496 belonged to Mambí de Cuba breed (3/4
Holstein ¼ Zebu), 17,178 Siboney de Cuba breed (5/8 Holstein 3/8
Zebu) and 31,797 Holstein. The purpose of the study was to compare
the multibreed genetic evaluation for milk production with genetic
evaluations of each breed. To estimate the genetic indicators and
breeding values of L305, a univariate animal model was used, which
included, as fixed effects, the combination herd-year-four-month
period of parturition. The age at parturition was used as linear and
square covariable, random effects of the animal, the effect of the
environment and residues. Breed was also included as fixed effect in
the multibreeding genetic evaluation. Heritabilities and repetitions were 0.31 ± 0.01 y 0.40 ± 0.01 for the multibreeding genetic evaluation, and 0.18 ± 0.05 and 0.41±0.02, 0.14± 0.05 and 0.41 ± 0.02, 0.12 ± 0.01 and 0.25 ± 0.01 for the independent racial evaluations of Mambí de Cuba, Siboney de Cuba and Holstein, respectively. In the multibreeding genetic evaluation, the estimation of heritability and the accuracy of breeding values for milk production of the three studied breeds increased regarding the evaluations of each individual breed, mainly because of a higher amount of information and higher connectivity among breeds, which contribute to decrease the environmental variance. It can be concluded that the inclusion of multibreeding genetic evaluations on the program of genetic improvement of Cuban milking bovines allows to obtain a better accuracy of breeding values, which will also contribute to the increase of the genetic progress for milk production.
Key words: genetic evaluation, multibreed, crossing
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