EN
The aim of the study was to estimate the state of fat metabolism in cows on the basis of some indices of the fertility test. Forty-eight cows divided into 4 groups were clinically and biochemically assessed at 4 and 2 weeks before parturition and 1—2 and 4 weeks after parturition. The following were evaluated: the level of glucose, total and HDL cholesterol, triglicerydes, total lipids and the concentration of fat free acids (NEFA). In the perinatal period some disturbances in fatty metabolism were found, as well as an increased NEFA concentration. In addition, a decreased content of triglicerydes and total cholesterol were observed. The changes were associated with low fertility of cows.