The effect of selenium supplementation on plasma sulphur, magnesium and selenium profiles of dairy cows

Interaction of Se supplementation with sulphur and magnesium in blood plasma were studied in dairy cows. Cows were divided into three groups: (1) control, no treatment; (2) cows injected intramuscularly 21–10 d prior to parturition with 45 mg Se and 2040 IU of vitamin E; (3) cows intraruminally administered with two 30-g pellets containing 10% elemental Se 2 mo prior to expected calving. There were no significant effects of Se supplementation on the plasma levels of sulphur and magnesium. Key words: Selenium, sulphur, magnesium, blood, cattle