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Genetic polymorphism of casein contained in milk of cows of Holstein-Friesian and Brown population



Genetic polymorphism of casein contained in milk of cows of Holstein-Friesian and Brown population



Zhivotnov"dni Nauki 29(5-8): 18-22



Examined have been 96 individual samples of milk of cows of the Holstein-Friesian and Brown populations. The genetic polymorphism of the casein systems - alpha-s1-Cn, beta-Cn, and kapa-Cn, have been studied. The frequency of the genotypes and alleles controlling them, have been found. The genetic equilibrium of the genotypes has been checked up. Besides the alleles found up to now, new cones have not been revealed. With alpha-s1 casein the BB type is of highest frequency (84, 78 and 80.00%) in the milk of Holstein-Friesian and Brown cows, with kapa-casein, it is the AA type (56, 52 and 58.00%), and AB type with kapa-casein (50.00 and 48.00%). According to the casein systems studied so far, the cows of the two breeds are in genetic equilibrium. The frequencies of the alleles with both breeds are in the following ratios: alpha-s1-Cn-B gt alpha-s1-Cn-C gt alpha-s1-Cn-A; beta-Cn-A gt beta-Cn-B gt beta-Cn-C; kapa-Cn-A gt kapa-Cn-B.

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