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The article presents the results of morphological, biochemical and immunological studies of the blood of cows using biologically active drugs. A double administration of aminoseleferon-b 45 and 15 days before calving at a dose of 5 ml with a 24-hour interval helps reduce the processes of lipid and protein peroxidation, the phenomena of endogenous intoxication with a simultaneous increase in humoral and cellular defense, activation of the antioxidant system. This is manifested by a decrease in the incidence of uterine subinvolution – by 1.3-1.6 times and postpartum endometritis - by 1.6-2.0 times.

MORPHOLOGICAL AND BIOCHEMICAL BLOOD PARAMETERS OF COWS IN THE DRY AND EARLY POSTPARTUM PERIODS WHEN USING BIOLOGICALLY ACTIVE DRUGS