Abstract
The results of genotyping of beef cattle (bull-calves of white-faced and Kazakh whiteheaded cattle) made it possible to establish the features of gene polymorphism ensuring meat efficiency (CAPN1, GH, TG5, LEP). Genotype carriers of selection significant alleles marking high efficiency and quality of beef are revealed. Superiority by body weight, daily average gains of homozygous (CAPN1CC GHLL TG5TT LEPTT) genotypes in comparison with alternative (CAPN1GG GHVV TG5CC LEPCC) genotypes was established in the selection of white-faced bull-calves by 13.2 and 14.9%, Kazakh white-headed – by 11.8 and 13.3%. The fatty acid composition of blood lipids of young white-faced, Kazakh white-headed cattle of different genotypes is defined. The features of fatty acid composition of blood lipids depending on pedigree and genotype of animals expressed by integrated indicators characterizing the intensity of biosynthesis of fatty acids are established: index of lipid saturation (ILS), index of lipid exchange intensity (ILEI), metabolism efficiency ratio of essential fatty acids (MER). The determined stable correlation of integrated indicators of lipid exchange intensity with body weight and daily average gains gives grounds for their use as biochemical test systems during lifetime assessment of young cattle breeding potential.
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