Selection strategies for the genetic improvement of the Siboney de Cuba and Mambí de Cuba breeds
Keywords:
dairy cattle, genetic evaluation, selection index, principal component analysisAbstract
Introduction: The genetic evaluation of the Siboney de Cuba (5/8 Holstein 3/8 Zebu) and Mambí de Cuba (3/4 Holstein 1/4 Zebu) bovine breeds is performed considering milk production using a single-character animal model for each breed independently. Objective. It was proposed to characterize the Siboney de Cuba and Mambí de Cuba herds, evaluate selection alternatives combining various traits, and methodologies to carry out genetic evaluations with greater precision.
Methods: The multiracial evaluation was carried out using a single-character model and the existence of environment genotype interaction (IGA) in another. Heritability, repeatability and genetic values (GV) were estimated using a single-character model for milk production accumulated up to 305 days (L305), total milk accumulated for life (LTV), duration of lactation (DL), age at first calving (EP1), first service calving interval (IPS), gestation calving interval (IPG), calving interval (IPP), productive life (VP) and the number of births per life (NP). Genetic correlations were estimated using a multi-character model for these traits and selection indices were constructed from the GV in 6,425 Siboney cows from Cuba and 5,445 Mambí from Cuba, by means of the analysis of principal components.
Results: The heritability and accuracy of the VG were higher in the multiracial evaluation.
Conclusions: In the case of the Mambí de Cuba, it is more efficient to use an index that considers L305, DL and LTV as selection criteria; while in the Siboney de Cuba it must include LTV, EP1 and IPG.
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