Academic Unit Specialized in Agricultural Sciences, Federal University of Rio Grande do Norte (UFRN), Macaíba, Rio Grande do Norte, Brazil.
Brazilian Association of Zebu Breeders (ABCZ), Natal, Rio Grande do Norte, Brazil.
Anim Biotechnol. 2023 Dec;34(7):3162-3164. doi: 10.1080/10495398.2022.2137677. Epub 2022 Nov 2.
The kappa () and beta-casein () genes are intensively genotyped in dairy cattle for selection purposes. This information is also generated and disseminated for Zebu breeds adapted to tropical climates. The objective of this work was to gather information on the genotypes for the and genes in three breeds (Gyr, Guzerat and Sindhi), and to verify the genotypic frequencies in the populations. The genotype AA and allele A frequencies are high for the gene, without changes in values over the years, possibly indicating a small gene participation in traits under selection. In addition, the A2A2 frequencies are high for the gene (<∼0.80). It is recommended to verify the association and contribution of genotypes in productive traits for these breeds. The potential of A2 milk production by these genetic groups is also confirmed.
κ-酪蛋白（）和β-酪蛋白（）基因在奶牛中被广泛用于选择目的的基因分型。该信息也被用于热带气候适应的瘤牛品种的生成和传播。本研究的目的是收集三个品种（Gyr、Guzerat 和 Sindhi）的和基因的基因型信息，并验证群体中的基因型频率。对于基因，基因型 AA 和等位基因 A 的频率较高，多年来没有变化，这可能表明该基因在选择性状中的参与程度较小。此外，对于基因，A2A2 的频率也较高（<∼0.80）。建议验证这些品种的生产性状中基因型的相关性和贡献。这些遗传群体产生 A2 牛奶的潜力也得到了证实。
