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Poultry farming is one of the largest branches of agriculture with a high level of production of a variety of organic wastes that require special approaches to useful utilization. The article describes the problem of processing evisceration waste and keeping poultry in quality feed supplements and the estimation of their effectiveness in feeding broiler chickens. In accordance with the studies, it has been established that the studied feed supplements, with a share of feather-down waste of more than 80%, differ in a balanced amino acid composition, a high content of protein (89.9–90.2%) and sulfur-containing amino acids, that is cystine and tryptophan that have a high value in the process of fattening the bird. The ratio of 8 : 2 (feather-down waste : litter) is recognized rational and optimal for a further use the feed supplement produced using this method contains glycine, the most important amino acid for chickens, and is characterized by a high content of calcium and phosphorus due to the components of litter. According to the safety indicators established by the regulatory documents, the feed supplement is recognized high-quality and safe. When estimating the toxicity of the feed supplement using the test organism Tetrahymena pyriformis, no adverse effect on the survival, mobility, growth and behavior of the cells was detected. When analyzing the relative biological value of the feed supplement using Tetrahymena pyriformis, it has been established that the average number of the cells grown with the use of the feed supplement is (8.9 ± 0.9) × 10 cells, which indicates its high nutritional value. Taking into account the results of the studies on the chemical and amino acid composition of the feed supplement, the data of microbiological and toxicological studies, and taking into account the toxicity estimation, it has been concluded that the studied supplement is safe and can be used in the birds diet.

ESTIMATION OF QUALITY AND EFFICIENCY OF APPLICATION OF A POULTRY FEED SUPPLEMENT IN FEEDING HUBBARD BROILER CHICKENS