Оценка молочной продуктивности коров разных пород в связи с полиморфизмом по гену альфа-лактальбумина

The directions a priority of new breeding dairy cattle related with the improvement of existing and the search of new genetic methods, as well as application of marker assisted selection. Milk protein genes are considered to be the most suitable genetic markers, were attributed to the quantitative and qualitative levels of milk production animals. The purpose of the study to improve dairy cattle breeding using DNA markers associated with milk production traits. In this paper examined materials from primiparous cows by breed cattle of Black and White, Kholmogor, Simmental and Brown Swiss. In the studied breeds of cattle (black-and-white, simmental, kholmogorskaya, brown swiss) found differences characteristic frequency of allelic variants of the gene alpha-lactalbumin (LALBA), however, the highest rate was observed for the allele A (71,0%), genotypes AA (49,0%) and AB (43.8%). The research results showed lack of significant associations between estimated traits a milk production and alpha-lactalbumin gene polymorphism except of percent protein in milk. The direction of this relation points to the desired allele A gene LALBA for selection of animals to the high content of protein in milk (+0,031%, F = 2,9, P