GENOTYPIC FREQUENCIES OF 4 POLYMORPHOUS SYSTEMS OF MILK-PROTEINS IN SLOVAKIAN PIED AND PINZGAU BREEDS

The goal of the work was to study the polymorphism of milk proteins, a nd its relation to milk composition in the Slovakian Pied and Slovakia n Pinzgau breeds. There were observed 4 polymorphous systems of milk p roteins - alpha s(1)-casein, beta-lactoglobulin, beta-casein and kappa -casein. We noticed differences between the breeds in alpha s(1)-casei n system, namely in representation of hetero- and homozygous form of a lpha s(1)-casein. Higher representation of the homozygous form BB was noticed in the Slovakian Pied breed, the heterozygous form BC prevaile d in the Slovakian Pinzgau breed. The most significant differences wer e with the kappa-casein system. The Slovakian Pied breed shows a highe r proportion of the more suitable allele B compared with the Pinzgau b reed (in which was apparent the shift to allele A). Milk with the geno typic frequency of AB and BB kappa-casein is more suitable for the che ese industry because it is marked by more suitable time of coagulation and better quality of the rennet coagulum.