Blood serum enzymes in clinically healthy cattle as a sign of breeding

In the course of research at the leading breeding farms of the Vologda region specializing in the breeding of highly productive dairy cattle of Holstein, black-and-white and Ayrshire breeds, mass studies of blood serum for the concentration of key enzymes in cows and heifers were carried out. Interbreed and age differences were established, as well as the relationship between the studied enzymes.