The authors of this article evaluated the effectiveness of the use of a feed additive based on soy protein hydrolysate in combination with iodine and selenium on laying hens of the Ross Hysex Brown cross. During the experiment, the following indicators were studied: safety, live weight gain, egg production, morpho-biochemical composition of blood. At the end of the experiment, the following data were obtained: the survival rate of the bird in the experimental group was 93,3 %, and in the control group the result was 86,6 %. The weight gain of laying hens in the experimental group increased by 11 %, the egg weight (average value) by 6,5 g (12,8 %), and in the control the increase was 2,7 g (5,2 %). In the experimental group, eggs per hen were obtained by 1,87% more than in the control group, in general, the experimental group showed an increase in the number of eggs during the experiment by 23,0 %. According to the results of the morphological and biochemical composition of the blood serum of birds, there are no significant negative changes. Red blood cells did not exceed intraspecific norms, but increased in the experimental group by 26,4 %. The amount of hemoglobin in the experimental group exceeded the control by 19,4 %. White blood cells in the experimental group were 16,9 % higher than this indicator in the control group. Biochemical analysis revealed a positive trend, which was expressed in an increase in the concentration of protein in the blood of chickens of the experimental group by 8,7 %, the level of calcium by 10,9 % and phosphorus by 31,3 % in birds of the experimental group exceeds the control.

The authors of this article evaluated the effectiveness of the use of a feed additive based on soy protein hydrolysate of the enzymatic cleavage method in combination with iodine and selenium in broiler chickens in the framework of studying its pharmacological properties. The indicators of livestock safety in the experimental group by the end of the experiment were 100.0 %, and in the control group − 84.0 %. In the experimental group, the increase in live body weight was 13.9 % higher compared to the group that did not receive a feed supplement. According to the calculations, the cost of compound feed per 1 kg of weight gain of poultry during the growing period in the ex-perimental group was 1.8 kg, which was 14.2 % lower compared to the control group. The slaughter yield of carcasses in the experimental group was 66.7 %, while in the control group − 62.0%. During the veterinary and sanitary examination, it was determined that the meat of the experimental and control group of broiler chickens was obtained from a healthy bird and was of good quality and suitable for further processing.

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