Abstract
The paper presents the results of determining the influence of line compatibility on the reproductive ability of cows. Scientific and economic experiment was carried out on the basis of LLC "Plemzavod im. Lenin" Koverninsky district, Nizhny Novgorod region. It was found that groups 1 and 7 had the greatest influence on the reproductive ability of cows, because the duration of lactation, dry period, calf yield and reproduction rate were close to optimal values. It was found that the yield of calves in these groups was 86 % and 91 %, respectively.
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