About adaptive intrapopulational differentiation of Kholmogor breed of cattle

The polymorphism of milk proteins and antigens of blood groups were investigated in cattle populations of the Kholmogor breed settled in few natural-climatic zones. The tendencies in distribution of ft-Cn and к-Сп loci frequencies are in agreement with their cline distribution in world population of Bos taurus L. The geographic cline, obtained proofs of selective elimination of some alleles, discrepancy of intrapopulational differentiation to breeding system, association of antigens of "simple" blood groups system with alleles of high polymorphous j9-locus are suggest about involving analyzed polymorphous determinants in selection process.