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In order to study the influence of the scheme of feeding the feed additive yeast hydrolyzate Protamine on the ability of pig blood neutrophils to absorb foreign material in different periods after the introduction of antigens and against the background of pre-slaughter manipulations, 3 groups of piglets of 10 heads of 58‒61 days of age were formed. Animals of group 1 were control. Piglets of group 2 received 5 g of feed supplement yeast hydrolyzate Protamin with water once a day for 2 months according to the scheme: 7 days ‒ watering, 7 days ‒ break. Animals of group 3 received the same amount of supplements, but according to the scheme: 7 days ‒ drinking, 14 days ‒ a break. It was found that after the introduction of antigens and pre-slaughter manipulations, the ability of pigs' blood neutrophils to absorb foreign material increased, but the adaptive reserve of these protective systems of the body disappeared. The absence of stress influences for a month contributed to the optimization of homeostasis and the emergence of an adaptive reserve of the absorption capacity of blood neutrophils. The use of the feed additive Protamine for 2 months according to both schemes one month after the end of the use of this drug led to the optimization of the homeostasis of the organism of experimental animals even under stress conditions (pre-slaughter manipulations). At the same time, the use of the feed additive Protamine according to the scheme: 7 days ‒ drinking the drug, 14 days ‒ a break is more effective under conditions of post-vaccination stress.

ABSORPTION CAPACITY OF BLOOD NEUTROPHILS OF PIG AT DIFFERENT SCHEMES OF USING THE BIOLOGICALLY ACTIVE SUPPLEMENT