REPRODUCTIVE QUALITIES OF BLACK-MOTLEY CATTLE OF DIFFERENT ORIGIN

Improvement of dairy breeds in the greater part should be based on the best genetic resources of domestic livestock. The use of imported livestock to improve the productive qualities of cows it is advisable to combine with productive longevity and reproductive qualities adapted to local agro-climatic and technological conditions of cattle.Reproductive function of animals is closely connected with the activity of the whole organism and in turn affects the metabolic processes, resulting in the body of females at different periods of the implementation of sexual function there are significant changes. In this regard, for the effective management of animal reproduction as a biological phenomenon it is necessary to know the features of formation and realization of reproductive function of ewes of different genotypes under certain conditions climatic zone.