The competitiveness of meat processing technologies requires deep processing of protein containing raw materials including low-value wastes and by-products of meat processing. The connective tissues after animal and poultry meat processing can reach 16 % of initial carcass weight and hence the reasonable utilization of these resources is reasonable. Low-value by-products can be transformed to protein products via hydrolysis resulting in the preparations of isolated collagen-rich high-purity proteins with key functional and technological properties for food, feed, medical, and cosmetic industries. Chicken skin (J. Stachowiac et al., 2004), necks and bones (M.I. Kremnevskaya et al., 2016; P.F. De Almeida et al., 2013), trachea of chickens, ducks and ostriches (T. Jaroenviriyapap et al., 2009) were studied as secondary collagen-rich raw materials. The most common techniques of collagen extraction are acidic and high-temperature hydrolysis (K.A.

Carcass meat quality and qualities of meat have been studied for new domestic “Smena 9” cross broilers raised to ages of 39 and 45 days with usage of barn management and different stocking density. Stocking density reduction and slaughter age increasing have been established to ensure carcass slaughter yield improvement and fat quantity increasing and also meat taste improvement.

аннотация: В статье приведены результаты эксперимента по выявлению в птицеводческом помещении участков с неоднородным микроклиматом (аэростазных зон) и определению зоотехнической и экономической эффективности выращивания бройлеров в разных микроклиматических зонах.

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Some researches inform on trimetilglycine positive effect on poultry growth and meat quality in heat stress conditions. However little attention is paid to amino acid content changes in muscles. “BetaFeed” BAA (betaine) with 32% of trimetilglycine has been introduced to broiler diet to study trimetiglycine effect on broiler meat amino acid composition and taste qualities. 50% of methionine has been replaced with betaine in 2 experimental group and 50% methionine and 50% choline chloride has been replaced in 3 group. The best result has been reached in complex trait (index of broiler growing) for 3 experimental group when replacing 50% methionine and 50% choline chloride with betaine. Difference with control is 76 units. However difference between control groups is little – 7 units only. Difference between experimental and control groups in essential amino acids quantity is 0.58 to 0.70%. Analogic results have been received for non-essential amino acids.