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One of the main problems of poultry farms located in the industrially polluted area is environmentally friendly products production. Iodine supplements in the rations of laying hens have a positive effect on mineral metabolism and the elimination of heavy metals from their bodies. To conduct the research according to the group-analog method, 4 groups of laying hens of the UK-Kuban UK cross were formed – 123, at the age of 29 weeks, 40 animals each. One group served as a control and was treated with a general ration, and the other three groups were experimental and, in addition to the diet, received respectively 1.0, 1.5, 2.0, mg of iodine (as potassium iodide) per 1 kg of feed. Conducted scientific and management experiment and data analysis show that the content of heavy metals in the studied muscles is reduced due to an increase in iodine nutrition. In particular, the zinc content in the chest muscles decreased by 12.3 mg/kg or 35 %, and in the leg muscles by 12.4 mg/kg or 30.7 %. At the same time, an increase in iodine nutrition contributes to a decrease in the concentration of heavy metals in the internal organs, which undoubtedly improves the ecological status of laying hens and the products obtained from them.

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The reliability of the results obtained in scientific and economic experiments on the study of the effectiveness of the use of various feed components, including biologically active substances in the rearing of broilers needs to be confi rmed in production conditions. The purpose of the research was to study the joint use of enzyme drugs and lecithin in the rearing of broiler chickens. The results of production experiment on the study of the effectiveness of the joint inclusion of enzyme drugs Sunzyme and Sunfyse 5000 as well as lecithin in the diet of broiler chickens of the cross Ross-308 have been presented in the article. Production tests have been carried out under the conditions of the breeding farm “Achkhoy– Martanovsky” in the Chechen Republic. The duration of the experiment was 45 days. For research on the principle of analog groups two groups have been formed: a control group and an experimental group of 1000 heads in each. The broilers of the control group have been fed compound feed prepared in accordance with the growing period and consisting mainly of grain components of local production. The broilers of the experimental group have been fed the same compound feed, but with the addition of two enzyme drugs Sanzyme and Sanfyse 5000 (100 g/t of feed) as well as lecithin (10 g/kg of feed). The results of the production experiment fully confi rmed the data obtained in the scientific and economic experiment. The positive effect of the joint use of the studied enzyme drugs and lecithin has been manifested in all the studied productive traits. In particular, the increase in live weight of broilers increased by 12,1 %, slaughter yield by 3,5 %, the yield of carcasses of the 1st category by 3,0 %. The main economic indicators also found their confirmation: feed consumption per unit of growth decreased by 11,7 %, additional profit was received in the amount of 27308,2 rubles, the level of profitability of broiler rearing increased by 18,4 %.