Immunogenetic polymorphism of Holstein cows in the Oryol population of dairy cattle

One of the promising areas is the study of the genetic diversity of the animal population, aimed at increasing the effect of breeding and preserving the gene pool of breeds. Studies have shown that this way it is possible to increase the productivity and safety of young animals by increasing resistance to diseases. To date, with the help of DNA markers, more than a hundred genetic defects of farm animals have been identified, which significantly affect their breeding qualities. The presence of such defects significantly reduces the yield of calves due to increased embryo death and increases the waste of young animals as a result of the fact that some inherited defects reduce resistance to bacterial diseases, and hidden diseases reduce productivity. In this regard, we studied the alleles of blood groups in 11 locus systems and the frequency of their occurrence. As a result, it was found that 50% of the animals are carriers of the A1, Y2, C1, W, X2, H’, FF, L alleles .