The analysis of some hereditary disease propagation among the bulls from PJSC “Krasnoyarskagroplem” and breeder flocks of the Krasnoyarsk region farms, which has been conducted by the authors, has revealed that bulls-manufacturers import has promoted not only genofond treatment with the desirable allels but also genetic deficit propagation. The authors draw the conclusion about the necessity to conduct the genetic disease monitoring in order to prevent anomaly propagation in the cattle populations.