FEATURES OF LACTATION ACTIVITY OF HOLSTEIN CATTLE OF THE MONTVIK CHIFTEIN LINE

Abstract

Currently in Russia, Holstein cattle occupy the first place in the country in terms of livestock, created in the process of long-term improvement of domestic black-and–white cattle due to the widespread use of the world gene pool of bulls-producers of the most abundant dairy breed - Holstein. The purpose of the work is to study the peculiarities of lactation activity of cows of the Montvik Chieftain 95679 line. As a result of research, it was found that animals of the Montvik Chieftain 95679 line surpass cows in terms of maximum lactation in terms of the last completed lactation, not only in terms of the amount of milk produced, but also in its quality, as well as the amount of milk fat and milk protein. They had a higher coefficient of milk production, the coefficient of biological efficiency of the cow, as well as the coefficient of biological usefulness. All the animals were dairy-producing, as evidenced by the high coefficient of milk production, which turned out to be higher than 1000 kg for every 100 kg of live weight. Animals of this line have a long period of increased productivity, an increase in milk yields was observed up to and including 6 lactation. The reproductive abilities of the group of cows of the Montvik Chieftain 95679 line are reduced, which is confirmed by low indicators of the coefficient of reproductive ability (CFS), which turned out to be lower than acceptable with a good level of reproduction. In animals of the Montwick Chieftain 95679 line, an increase in productivity for maximum lactation was accompanied by an improvement in reproductive ability, as indicated by a shorter service period, which decreased by 22.5 days or 13.2%. Thus, there is no positive relationship between milk yield for 305 days of lactation and the duration of the service period.