The indicators of the dairy productivity quantity and quality of the black and motley breed cows inTrans-Urals depending on the genetic proximitylevel on the Holsteincattle breed are presented in the article. It is established that the Holsteinizedcow-heifers of the black and motley breed with thegenetic proximity of 91-95 % have the advantage in themilk yield of 305 lactation days in comparison with cows with thegenetic proximity of 50 % 320 kg (7,4 %), with thegenetic proximity of 70-75 % -355 kg (8,3 %).
black-and-white breed, genetic proximity on Holsteins, dairy productivity, origin, lactation, the mass fraction of fat and protein in milk
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