Milk productivity and adaptive capacity of daughters of bulls of different ecogenesis

The data on milk production of daughters of bulls of different breeds and ecogenesis. Analyzed milk yield, protein and fat content in milk of cows of breeding reproducer. A significant advantage of daughters of bulls of the Danish selection for the yield of milk and fat content in milk. For the yield of milk at first and second lactation, they exceeded the first group (control) on 457.4 kg (P > 0.999) and 487,8 kg (P > 0.99), butterfat - 0.1% (P > 0.999) and 0.07% (P > 0.99), respectively. Daughters of bulls form the canadian selection was significantly inferior to the daughters of bulls of the red pied breed on the content of milk fat and milk protein. On fat content for first and second lactations of the daughters of the bulls form the canadian selection was inferior to the cows of the first group (control) by 0.03% (P > 0.95) and 0.14% (P > 0.999) and protein - 0.04% (P > 0.99) and 0.06% (P > 0.99), respectively. Daughters of crossbred bulls was characterized by a higher content of protein in milk. Exceeded for this indicator cows of control group for first and second lactation by 0.1% (P > 0.999) and 0.07% (P > 0.999), respectively. The main reasons for disposal of cows from the herd: gynecological diseases, obstructed labour and complications after them, diseases of the udder and feet.