The experiment was performed in 2003 and 2004, on a herd of 140 dairy cows. The aim of the study was to determine the effect of TMR and PMR feeding as well as of the pro-portion of HF genes on cow productivity. Slight differences were found between cows fed a TMR and PMR with regard to the yields of milk, milk fat, milk protein and ECM (energy-cor-rected milk) per day of lactation. This indicates that the higher productivity of cows fed a PMR resulted only from the fact that lactation periods were by over a month longer in this group. It follows that the feeding systems tested in the study had no impact on production results. Re-gardless of the feeding system applied, statistically significantly higher yields of milk, milk fat, milk protein and ECM as well as yields determined per day of lactation were attained in the group of crossbred cows with morę than 75% of HF genes. In the group of purebred Black-and-White cows better production results were achieved in the TMR system.

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