Dependence of the nonspecific resistance in cows from their physiological and clinical state.

In cows phagocytic, bactericidal, and lysozyme activity increased with increasing pregnancy term, decreased by the 2nd day after labor, and increased in the follow-up period. The nonspecific resistance decreased most significantly in the winter-spring period.

Changes in blood cytochemical indexes in animals during pregnancy and after labor.

Intraleukocytic microbicidal activity of blood neutrophilic granulocytes in cows increased with increasing the term of pregnancy, decreased over the first 2 days after labor, and increased again in the follow-up period. Activity of microbicidal systems markedly decreased after labor, especially in the winter-spring period.