It has been established that chicory feed additive at a dose of 70 mg/kg and lactic acid – 0.5 ml/kg of live weight of broiler chickens, with separate and joint inclusion in the diet of poultry has a positive effect on the digestibility and use of nutrients in the diet. The stimulating effect of feed additives on metabolism in the body of broilers, an increase in oxidation-reduction processes due to increased hematopoiesis and the number of erythrocytes has been proven. It was calculated that the experimental groups exceeded the control group in the number of erythrocytes by 20.4–37.5% with the addition of chicory, by 8.8–35.2% with lactic acid and by 10.3–34.8% with their joint use. It was confirmed that the most active transport of lipids in the bird's body for metabolic processes during the growing period was observed in the group of broilers receiving only chicory and both feed additives. Compared with the control group, the difference was 18.9–32.9 and 2.8–19.2%, respectively. It was found that the concentration of amylase and lipase in the blood serum of broilers during their growth changed depending on the composition of the compound feed and the functional state of the liver under the influence of feed additives. A comparison was made of the leukocyte profile of bird's blood, which showed an increase in the level of lymphocytes and monocytes in the broiler group using chicory alone and in combination with lactic acid. It was found that the phytobiotic complex with lactic acid stimulated post-vaccination immunity in the bird's body to a greater extent to infectious bursal disease, while the addition of lactic acid stimulates infectious bronchitis in chickens.

Ovchinnikov Alexander A., Shepeleva Tatyana A., Yaptik Natalya D.

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