Efficiency of breeding work with Russian cattle breeds using straight breeding and crossbreeding

The farm tests, conducted on the Russian cattle breeds of the Vologda Region, have shown that mixed bred animals, raised as a result of crossbreeding the black-and-white, the Kholmogory and the Yaroslavl breeds with the Holstein servicing bulls, excel their single bred herdmates in the milk yield and the amount of milk fat. They mature earlier, at the same time they have lower reproductive traits.