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One of the ways to increase profitability of beef production is development of meat cattle breeding through formation good breeding base. Creation the high value herds are impossible without attraction of the best genetic resources. However, even high value animals can carry undesirable alleles of genetic conditions and using such animals in breeding programs without control can cause serious economic losses instead expected benefit. And so it`s important to managing of genetic defects avoiding their manifestation in populations. In our study, we have analyzed mechanisms of appearance and inheritance of genetic conditions and principles of their classification. We have followed the dynamics of appearance of genetic diseases in XX-XXI centuries and established that the distribution of genetic abnormalities has been associated with the development of artificial insemination approach. We also have revealed that genetic defects occur in all cattle breeds independent from productivity direction. Using the data of American Aberdeen Angus Association we have counted that the frequency of the most of common genetic defects is reduced thanks of development of DNA technologies. Moreover, we have familiarized with the approaches of the breed associations of different countries in relation to genetic abnormalities. Based on obtained data we have developed the guidelines for control of genetic defects of beef cattle to prevent their spread in populations.

GENETIC DEFECTS OF BEEF CATTLE AND NECESSITY OF THEIR MANAGING