[Analysis of nonrandom associations of alleles in four milk protein loci in populations of the Yaroslavl cattle breed].

In two populations of Yaroslavl cattle breed, analysis of linkage disequilibrium was performed with respect to four milk protein loci, physically linked (caseins CASAS1, CASB, and CASK) or unlinked (caseins and b-lactoglobulin, LGB). Gametic disequilibria between CASAS1 and CASB and between CASB and CASK were detected in both populations, whereas those between CASAS1 and CASK or CASAS1 and LGB were found only in the Gorshikha population. Additionally, analysis of the joint distribution of genotypes with respect to these loci was carried out by means of contingency tables. Genetic structure of the breed is discussed.