The paper deals with the influence of different feed quality on the chemical composition and features of nutrient accumulation in the somatic muscles and hepatopancreas of two-yearold carp species. Fish were fed using pendulum auto-feeders on demand with K-111 compound feeds (23% protein and 3.5% fat) and Karp 38/12 (38% protein and 12% fat). In variant I, K-111 compound feed was used (in both car feeders), in variant II – Karp-38/12 (in both car feeders), in variant III–K-111 and Karp-38/12 (in different car feeders). The bionic method allows identifying the preference of fish for a particular type of feed. Regardless of the diets used, the water content in organs and tissues decreases during the growing of two-year-old carp species, which is primarily due to the accumulation of fat. To a lesser extent, this is due to the number of dry fat-free substance.

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Poultry farming as one of the most intensive branches of animal husbandry, and it uses a large amount of various feed supplements in order to obtain the maximum production volume. This article presents the results of a study on the effect of feed supplements used for feeding broiler chickens. Until the age of 42 days, the chickens received a phytase-containing enzyme supplement, mineral supplements Mn and Ca in a citrate form and a vitamin supplement of 1,25-dioxycholecalciferol (vitamin D3, calcitriol). The live weight of the chickens was measured at the age of 1, 4, 7, 14, 21, 28, 35 and 42 days. The femur development of the chickens was studied through morphological methods (morphometry and histological examination). The influence of various supplements (from the combined to the mutually absorbing ones) on the growth and development of the long bones of broilers was identified. Keywords: poultry, broilers, feed supplements, vitamin D, mineral supplements, enzyme supplements, histology, bones