The influence of αs1-casein and αs2-casein genes on milk productivity of alpine and nubian goats

An important factor affecting the performance of goats is the presence in their body of various genetic variants of casein, the main protein of milk. Studies show that Alpha-S1-casein and Alpha-S2-casein play an important role in the milk production of goats, determining the quality and characteristics of goat milk. This article presents the data obtained as a result of the study of the polymorphism of CASN1S1 and CASN2S2 genes in the Alpine and Nubian goat breeds. 124 goats of the Alpine breed and 98 goats of the Nubian breed were progenotyped. It was shown that animals with the CSN1S2AA genotype exceeded the carriers of the CSN1S2AB and CSN1S2BB genotypes with high reliability in terms of the content of the mass fraction of protein and casein in milk. According to the highest milk yield and the minimum number of somatic cells in milk, carriers of the CSN1S2AA genotype were distinguished, which were significantly superior to animals of other genotypes. To increase cheese production, it is preferable to select animals of the complex genotype CSN1S1CC/CSN1S2AA.