E. Chobotova et al., GENOTYPIC FREQUENCIES OF 4 POLYMORPHOUS SYSTEMS OF MILK-PROTEINS IN SLOVAKIAN PIED AND PINZGAU BREEDS, Czech Journal of Animal Science, 43(11), 1998, pp. 497-501
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.