The Holsteinization influence on the dairy productivity quantity and quality of the black-motley breed cows

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 %).