Abstract
The purpose. To investigate influence of season of calving of cows upon realization of genetic potential of their productivity. Methods. Analysis of variance of attributes of milk yield, correlative interaction of breed with amount of lactations. Results. Implementation of genetic potential of productivity of cows of Ukrainian black-motley dairy breed in conditions of steppe zone of Ukraine with optimum toughness and stability of lactation depends on season of their calving. These indexes can be used also as criterion of conformity of ecological conditions to that genotype, and divergence specifies an opportunity of the subsequent selection operation. Conclusions. In steppe zone of Ukraine the genetic potential of productivity with optimum toughness and stability of lactation is more full manifested at calving cows of Ukrainian black-motley dairy breed in I and IV quarters of year.
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