Intrapopulation differentiation of cholmogoric purebred cattle for gene frequencies of kappa-caseine locus

Investigation of the sampling of 2907 cows from 17 farms of three regions of the Non-chernozem zone of the European part of Russia showed that kappa-caseine synthesis is controlled by two allelic genes - æ-Cn^А and æ-Cn^В. The average frequency of the æ-Cn^А was 0,689; of the æ-Cn^В - 0,311; in factory herds - 0,718 and 0,282, respectively; in reproductive herds - 0,714 and 0,286, respectively; in market herds - 0,629 and 0,371, respectively. The high frequency of æ-Cn^В allele (0,331) has been revealed in subpopulation of cholmogoric cattle of the Komi Republic. In the herds of cholmogoric cattle of the flood-plains of Pechora river æ-Cn^В frequency reached 0,520 and 0,575. The assumption is made about selective role of polymorphism and necessity of rational use of gene pool of domestic cattle.

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