Аминокислотный состав мышечной ткани у овец западно-сибирской мясной породы в постнатальном онтогенезе

The study of morphological features of muscular tissue growth, its development and biochemical composition of sheep muscles in postnatal ontogenesis is a topical issue. West Siberian mutton breed (Zapadno-Sibirskaya myasnaya poroda) of sheep was bred to produce high-quality lamb (Patent No. 54176). The need for that breed was determined by the goal of increasing mutton performance of sheep adapted to the adverse Siberian conditions. Those sheep reveal good reproductive features, and they are fast maturing, and reveal high dressing percentage at early age. The research goal was to study the amino-acid composition of muscular tissue, particularly of longissimus dorsi muscle, of Western Siberian mutton breed in postnatal ontogenesis. The study of the amino-acid composition was conducted with the use of Optima 7300 DV and MKS-01A Multirad spectrometers and Stayer 2 liquid chromatograph. The quality protein quotient was defined by tryptophan (the index of native proteins of muscular tissue) to proline (the index of partial connective-tissue proteins) ratio. It was found that in 12-months hog-lambs the tryptophan content decreased by 447.6 mg kg as compared to newborn lambs, and the proline content by 6495 mg kg respectively. The quality protein quotient of longissimus dorsi muscle in 12-months hog-lambs was two times as much compared to newborn lambs. Thus the quality protein quotient which determines the biological value of sheep muscular tissue insignificantly increases with age. It was found that muscular tissue protein in West Siberian mutton sheep had some reserve of almost all kinds of essential and nonessential amino acids, and that reserve differed for certain amino acids. It is concluded that the mutton of 12-months West Siberian sheep is of the greatest nutritional value.