Abstract
The dynamics and reasons for disposal of cows from the herd in the UE Agrarian complex Zhdanovichi, as well as the effect of paratypical factors on longevity and lifetime performance in cows were studied. Before the fifth lactation, approximately 94% of cows are disposed before having reached their maximum productivity. The major body of the animals is removed from the herd due to limb diseases and injuries (33.7%), as well as due to the digestive system diseases (30.4%). The average length of production survival of cows was 2.2 lactations, the period of the peak milk yield per cow is up to 3-4 lactations. It was established that with an increase in the milk yield per cow for the first lactation, the length of production survival of a cow decreases, but the milk yield per 1 day of life, lactation, and average lactation increase. Lifetime milk performance and length of production survival in cows increase slightly as the age of the first insemination grows, whereas the milk yield per day of life and 1 day of lactation decrease.
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