Changes in the live weight of cows with age and its impact on their productive qualities

In the Sverdlovsk region, holstinized black-and-white cattle of Ural type is bred, which represented by large, highly productive animals with a high genetic potential for productivity. The purpose work to study dynamics live weight cows age and its relationship milk animals, there an increase in 22.6 kg (from 3 4 lactation) – 46.2 first 2 or 3.4 7.9%. With weight, was yields up lactation, then their decrease. greatest decrease observed fifth lactation. coefficient production decreases accompanied weight. Despite yield every 100 cows, all them turned out be dairy-oriented However, it should noted that achieving 710 more leads efficiency cow use. There low negative between cows.