Connection of fat content in milk of heavy breed males with blood groups, alleles and antigens of erythrocytes

Studies on the influence of blood groups, alleles and antigens of erythrocytes on the fat content in the milk of mares of heavy draft breeds were carried out on the basis of the dairy farm of the Semyonovskiy breeding plant CJSC and in the laboratory of clinical diagnostics and biochemical research of the Gary State University, Department of Livestock Production Technology. The chemical composition of milk from mares of heavy draft breeds was determined in the laboratory of the breeding kumys complex of ZAO PZ "Semyonovsky". The analysis of milk for fat content was carried out on the device "Klever-1M". The allele pool was determined according to the D blood group system of the Lithuanian and Russian heavy draft breeds, bred in ZAO PZ "Semyonovskiy". According to the D blood group system, 19 out of 36 possible genotypes have been established in Russian and Lithuanian mares. The highest fat content was observed in Lithuanian heavy draft mares with DdkDcgm genotypes and Russian heavy draft mares with DcgmDdghm genotypes. The share of genotypic influence on the fat content in milk was 0.1227 (p>0.95) and 0.1881 (p>0.95), respectively for breeds. Taking into account the revealed positive relationships of immunogenetic parameters with the content of fat in the milk of mares, it is possible to recommend the use of the results obtained to adjust the selection in terms of selection and breeding work.