Hybrids performance indicators of black pied and Holstein cattle breeds and fertility potential

The presented article discusses the issues of milk productivity in the 2nd lactation of Black Pied cows of different genotypes, their biological indicators in the basic and main comparison farms. Observations were made on the fertility of different groups of animals, the age of insemination of heifers, the live weight of heifers at insemination, as well as breeding criteria, reproductive longevity and lifelong fertility of cows.