EN
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, productivity level of stocks, agricultural quality of the farms. Breeding and phenotype values changed regularly and markedly, affected only by productivity level. The other factors did not affect significantly the average values of milk production in cows kept on both kinds of farms. Various environmental conditions in the Sudetes Region did not influence adversaly cow performance. Therefore, they cannot be an obstacle in the development of cattle breeding in this area.