Genetic parameters of milk were estimated on the grounds of the number of 103 264 testing lactations by using the REML-Animal Model. The maximum amount of h² (about 0.35) were noticed for milk’s productivity, lactose and protein in the middle of lactation, for protein and fat – about 260 day of lactation but h² LnSCC during the all process of lactation was 0.18. The highest amount of repeatability’s coefficients were found in the first and the last days of lactation. During the all process of lactation, correlations between productivity of milk and productivity of protein and lactose were high (about 0.9), between productivity of milk and consistence of fat and protein were negative. The studies showed that correlations between productivity of milk and productivity of LnLKS were fluctuating from 0.2 in the 50 day of the lactation, to – 0.1 in the second half of lactation.

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