Influence of inbreeding degree on the milk yield efficiency

The Ural type of the domestic Black-and-White mottled breed cattle features high rates milk productivity, good suitability for industrial milking technology, but productive longevity is 2.4–2.6 lactations only, although in herds there are livestock cows with a up to 10 lactations. decline associated deterioration reproductive qualities cows. In result research it was found that most resistant long-term use conditions dairy complexes production pedigree reproducing farms were Siling Trajun Rokita line. Their period 4.0 other lines, ranged from 1.8 (Pabst Governor’s line) 2.5 (Montvik Chieftain’s A low fertility rate (less than 0.95) indicates presence reproduction problems herd. modern Holsteinized black-and-white cattle, bred Sverdlovsk region, possess breeding qualities. potential their quite and, despite certain system, they can produce long time environmental and forage zone.