South Ural State Agrarian University, (Chelyabinsk region, Troitsk)
Summary In the highly productive herd of Holshtinized cattle, the main share was occupied by the animal lines Vis Back Aydial 1013415 and Reflection Sovering 198998. At the same time, the first calves of the Vis Back Aydial line 1013415 by 267 kg, or 5.1%, outperformed the peers of the Reflection Sovering line 198998, in milk fat - by 12.1 kg, or 6.2%. The total amount of milk obtained in the groups for three lactation -18090 kg was obtained from cows separated by the first lactation to 5001 kg or more, in the groups of less productive peers it was obtained by 3692 and 3604 kg, or by 20.4 and 19.9% less. The first calves of the studied lines with impact for lactation up to 4000 kg of milk were lacted in a herd from 4.4 to 4.7 lactation, their lifetime productivity was higher by 1325-3038 kg of milk, respectively.
