Productive and reproducive features of cows of different lines

The article is devoted to the study of productive and reproductive characteristics of cows of the Black-and-White Holstein breed of various linear affiliation. The article presents data on the analysis of productivity and reproductive qualities in a herd of cows. The following indicators were studied: milk yield for 305 days, fat and protein content in milk, live weight at the first insemination, age at the first insemination, duration of the service period and pregnancy. It was determined that the first heifers of the line Vis Back Idial 1013415 are superior in milk productivity for 305 days of lactation of the first heifers of other lines. The best fat content of milk was noted in cows of the line Montvik Chieftain 95679. The content of protein in the milk of cows of all lines was the same. The highest live weight of the first insemination is observed in the line Reflection Sovering 198998 - 438.2 kg. The highest service period was observed in cows of the line Reflection Sovering 198998, and the shortest one was in cows of the line Montvik Chieftain 95679. The highest coefficient of reproductive ability is observed in the second lactation in cows of the line Vis Back Idial 1013415 had the highest coefficient - 0.95