The birch mushroom feed additive (chaga) in the dose of 20; 40 and 60 mg/kg of live weight of broiler chickens applied in the form of 5.0% decoction per daily rate of compound feed with subsequent drying to the initial moisture content was studied. It was found that of all the dosages, the optimal was the input rate of 20 mg, which during the growth period of the bird contributed to an increase in the digestibility of crude protein by 4.05% at the age of three weeks of broilers, by 3.17% at five weeks; crude fat by 1.92 and 4.15%, respectively. The calculation of the deposition of nitrogenous substances of the feed in the bird's body showed that in this group of broilers their retention was higher by 5.1–16.1%; with an increase in the rate of the feed additive, the use of nitrogen in the bird's body was lower. It has been proven that the studied dosages did not have a negative effect on the digestibility of crude fiber and the BEF group in the poultry body. It has been established that the live weight of broiler chickens in the group with a low dosage of birch fungus exceeded the control group by 5.0%, with an average input rate – by 3.4%, with a high one – by 1.5%. The positive effect of a low dosage of the feed additive on improving the meat qualities of the carcass of broiler chickens has been substantiated. An analysis of the economic assessment of broiler chicken rearing has been conducted, which allowed us to conclude that the chaga input rate of 20 mg increased the payment for feed in products by 4.9%, production profitability increased by 2.4%, feed costs decreased by 4.7%, while in other experimental groups the difference was less pronounced.

Ovchinnikov Alexander A., Shepeleva Tatyana A., Rostova Oksana V.

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