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Cows from the farms located in the Sudetes and highland of Sudets were included in the studies. Milk production and fertility of 21699 Red-White cows /14029 primigravida/ from 71 state farma and 1707 cows /558 primigravida/ kept on private farms were studied. The phenotype and breeding values of the cows were calculated according to: the number of cows in a stock, location of the farms above sea level,...
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