A difference in allele and genotype frequencies of milk protein kappa-casein in bulls offered for artificial insemination and their real proportion in a population of cows
2008
Bezdicek, J.,Agrovyzkum, Rapotin (Czech Republic)
The aim of this study was to evaluate the allele and genotype frequencies of the kappa casein (CSN3) in bulls offered by breeding companies (n=287) and the real proportion (RP) of these genotypes in the population of Czech Fleckvieh cows (n=27,970) born between 1994 and 2004. The average values were as follows (genotype frequencies in fathers and their RP, respectively): AA=0.3902, 0.4572; AB=0.4774, 0.3993; AE=0.007, 0.0004; BB=0.115, 0.1394; BE=0.0105, 0.0036; the EE genotype was not found. The average frequencies of the alleles were as follows: A=0.6324, 0.6571; B=0.3589, 0.3409; E=0.0087, 0.002. Significant discrepancies between the frequencies of the genotypes AA, AB and BB in the fathers and their RP in the population of cows were observed in most of the years studied.
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