Abstract
A reliable effect of the genotype on the number of normal and abnormal spermatozoa in thawed semen was es-tablished. A noticeable difference was marked between the lines of bulls in the presence of primary anomalies associated with the head or acrosome of the cell. It is proved that a significant increase in the count of abnormal spermatozoa in thawed semen leads to a decrease in the fertilizing capacity of the semen. It was found that the country of selection possesses no significant effect on the average number of normal and abnormal spermatozoa. It was revealed that with an increase in the proportion of the genotype for the Holstein breed up to 75%, the number of abnormal spermatozoa in semen significantly increases, while the number of anomalies in the head area increases reliably. With an increase in the proportion of the Holstein breed genotype up to 87.5%, the number of sperms abnormal in the body and tail area significantly increases and the fertilizing capacity of spermatozoa significantly decreases.
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