Cows` productive longevity of various genotypes

Comparative characteristic of usage duration and live productivity of cross-bred Golshtint cows of different pedigree and thorough-bred cows of different origin was given in the article. It was established that productive longevity of cross-bred decreases with the pedigree increase, but among thorough-bred animals the highest usage duration and live yield belongs to Kholmogorskaya cows.