Resumo

CATOTA-GOMEZ, Luis David et al. Frequency and association of polymorphisms in CSN3 gene with milk yield and composition in Saanen goats. Ecosistemas y recur. agropecuarios [online]. 2017, vol.4, n.12, pp.411-417. ISSN 2007-901X.  https://doi.org/10.19136/era.a4n12.1165.

K-casein (CSN3) gene is of particular interest in goat production due to the effect of its polymorphisms on milk quality and composition. The objective of this study was to assess the genotypic and allelic frequencies in CSN3 gene in the Saanen goat breed and its effect on milk production and some of its compositional traits. Allelic discrimination assays were designed to determine the variants (A, B or C) using qPCR and allelic discrimination method. Allelic frequencies for A, B and C were 0.23, 0.64 and 0.13, respectively. Association analysis indicated that the CSN3 was significantly associated only with protein percentage (p = 0.006). Results indicated that animals with AC, BB and CC genotypes showed higher milk protein percentage than those with genotype AB. This evidence suggests that genotypes favorable to this associated trait could be included into Saanen goat breeding strategies.

Palavras-chave : Allelic discrimination; caprine; kappa casein; milk quality.