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The influence of the genotype of sire bulls on their reproductive capacity has been studied. It was found that genetic factors affect the reproductive capacity of bulls. So, the highest rates were obtained from the bulls of the P.I. Star 1441440 genealogic line. With an increase in the breediness of the Holstein breed in bulls, the volume of ejaculate reliably increases, the concentration of sperms in the semen and the number of full-fledged spermatozoa in one ejaculate, but fertilizing capacity after the first insemination, on the contrary, decreases. In bulls of the Western European selection, the fertilizing capacity of the sperm is 6.7 -7.0 pp. lower than that of the Belarusian and Russian peers.

REPRODUCTIVE CAPACITY OF SIRE BULLS OF DIFFERENT GENOTYPES IN RUE «VITEBSK BREEDING ENTERPRIZE»