IMMUNE STATUS OF OFFSPRING CALVES OF SERVICING BULLS OF FOREIGN BREEDING AND DOMESTIC STUD FARMS

Pedigree bulls make the contribution of genetic progress to the population, therefore, an assessment of the immunological status of their offspring will add the characteristics of the breeding qualities of bulls and develop ways to increase the congenital immunity of young animals. The results of the studies suggest that the offspring of foreign servicing bulls has a decrease in the humoral link of the immune system compared to the offspring obtained from bulls of domestic stud farms and foreign bulls brought to Russia at eight months of age. The observed decrease was expressed in a reduced level of G-class immunoglobulins by 40%, of M-class – by 5 times and of IgA – by 60%, as well as in a decrease in the number of T-lymphocytes in the blood of calves.