Abstract
Abstract. In 2011, the Iltyakov V. N. farm in the Chastozoozersky district of the Kurgan region (Russia) brought from Canada pure breeds of three breeds – Landrace, Duroc and Yorkshire. The aim of the research was a comprehensive assessment of the amino acid composition of the muscle tissue of purebred and hybrid young animals obtained in the conditions of the Kurgan region, and reflecting the process of adaptation of pigs imported from Canada to new climatic and technological factors. The scientific novelty of the research was that for the first time in the conditions of the Kurgan region, the adaptation of Canadian selection pigs to new climatic and technological factors was studied by studying the amino acid composition of their longest back muscle. Methods: The amino acid composition of the longest muscle of the back was determined on an LC-20 Prominence instrument (Shimadzu, Japan) according to the method M-02-902-142-07 „Method for measuring the mass fraction of amino acids by high-performance liquid chromatography“. The results indicate that three-breed hybrids exceeded their analogues in the amount of interchangeable amino acids in muscle tissue samples (13.577 %) by 0.496 and 0.031 %, respectively. A similar pattern was revealed by the sum of essential amino acids. Their advantage was noted in the samples of muscle tissue of three-breed hybrids (8.984 %), which is 0.364 and 0.111 % more than pure-breed landrace and two-breed hybrids, respectively. In the sum of essential amino acids, regardless of the breed of young animals, aspartic acid (1.964–2.273 %) and glutamine (3.011–3.459 %) are present in the largest amount in muscle samples. The amino acid index and the protein-quality indicator of muscle tissue of three-breed hybrids are 0.27 and 33.55 % (P ≤ 0.05) more than pure-breed landrace and 0.67 and 53.33 % compared with two-breed hybrids, respectively.
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