Infl uence of biologically active substances iodine and selenium on meat productivity and meat quality of broiler chickens (review)

The purpose of the work is to analyze the eff ect of biologically active substances iodine and selenium on meat productivity and meat quality of broiler chickens. Iodine is a key element in regulating the functioning of the thyroid gland; without this microelement, the synthesis of thyroid hormones (thyroxine and triiodothyronine) necessary for normal growth and development of the body is impossible. In addition, iodine stimulates protein, fat, carbohydrate metabolism, the synthesis of substances in the body, increases immunoreactivity, and also has a benefi cial eff ect on the functional state of the reproductive system of animals. Selenium is an equally important microelement that accelerates oxidation and reduction reactions, increases the intensity of metabolic processes and the digestibility of nutrients. In addition, together with vitamin E the antioxidant prevents excessive formation of free radicals. Selenium also has the property of replacing vitamin E in some cases, aff ecting the processes of tissue respiration and the immunological reactivity of the body. The use of selenium as an antioxidant shows high efficiency in increasing poultry productivity. Selenium is a component of the enzyme glutathione peroxidase, which neutralizes the action of free radicals that damage the structural components of cells. Enrichment of broiler chicken meat with iodine and selenium can help to compensate for their defi ciency in food products for the population, especially in regions where there is a defi ciency of these microelements. The use of organic and inorganic forms of selenium and iodine in feeding broiler chickens helps to increase live weight, preservation, digestibility of nutrients in diets, as well as the coeffi cient of biological completeness of broiler chicken meat.