Polimorfismo genético de la kappa-caseína en ganado criollo limonero Genetic polymorphism of kappa-casein in creole limonero bovine

In order to assess the polymorphism of CSN3 gen in Limonero Creole breed, blood samples were collected from 163 male and female individuals, with which characterization through RFLP-PCR was conducted. Results showed that genotypic frequencies were 0.11, 0.56 and 0.33 for AA, AB and BB, respectively. Allelic frequencies were 0.39 and 0.61 for allele A and B, accordingly. It is important to mention that with this information of CSN3 and its relationship with some traits such as milk production and cheese productivity, markers-assisted genetic improvement plans can be undertaken, which would maintain genetic variability of these local populations characterized by small numbers of animals and by the constant threat of crossbreeding with improved or commercial breeds, with the objective of increasing milk production over product quality; moreover, a potential advantage of Limonero Creole breed in milk production by its having mainly B-type alleles in CSN3 is shown.