Abstract
The effect of genotypic factors on longevity and lifetime performance of cows in the herd of the UE Agricultural complex Zhdanovichi has been studied. Cows of Swedish breeding possessed the highest length of production survival – 2.7 lactations, however, their milk yield per average lactation was 714 kg less than the average for the herd. The lowest milk yields in the lifetime performance were obtained from cows of Dutch, Russian, German breeding. The maximum profitability was obtained from the production use of cows of Estonian (33.4%), Russian (27.2%) and Italian (27.2%) breeding. A downward trend is observed for lifetime performance and production survival length with an increase of the Holstein breed ratio in the breeding genotype, while milk yields per average lactation increase. The profitability and surplus per cow grow with the increased ratio by the Holstein breed.
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