[Genetic differentiation between breeds of horses by polymorphic blood protein loci].

The estimation of genetic differentiation between 27 horses breeds originated in USSR, based on serum proteins polymorphism (loci Tf, Al, Es) is shown. Genetical variability among aborigine breeds is higher then among cultural ones. The erosion of gene pool of Przewalski's Horse is explained by special history of this population and a few horses in analyzing group. Genetic distances reflect the directions and intensity of breeding. High genetical distances between Przewalski's Horse, Shetland Pony and other horses obtained could be explained by overcoming the "bottle neck" of selections in breeding process. Results of investigation shown that 9 aborigine breeds of USSR are clustered in a special group, differed from foreign horse breeds, because their gene pool was quite unique.