Application of immunogenetic testing in the selection of dairy cattle of Simmental breed

Marker breeding of dairy cattle is a modern method to ensure rapid breeding progress to improve the genetic potential of animal productivity. The aim of the research is to study the antigenic composition of erythrocytes in cattle blood and to determine the main directions of breeding work in the herd. The research object was 50 cows of the Simmental breed of the breeding reproducer of the Tyumen region. Seven genetic blood systems including 30 antigens were revealed. The carriers of O´ antigen were characterized by higher milk yield during the first 100 days of lactation (P > 0.95), but lower mass fraction of milk fat, less by 0.1% (P > 0.99). Cows whose B-system included the F´ antigen also had a lower milk fat mass fraction by 0.14% (P > 0.95), but a relatively high milk protein mass fraction by 0.03% (P > 0.95). Animals with the L´ antigen (C-system) were characterized by a relatively high mass fraction of milk fat, higher than the average for the sample by 0.14% (P > 0.95). When selecting Simmental cattle of the studied population for increased milk abundance, the presence of F´ O´ antigens (B-system) and E (C-system) can be a selection criterion.