A two-year-old research aimed to determine the effect of Bovifosfomag mineral mixture supply was conducted in two farms A and B, where mineral deficiency had been recognized. Over the experimental period, the value of the experimental cows` feed supplementation was assessed analyzing the concentration of mineral elements in blood serum. The mineral mixture administered to the animals from the experimental groups (D) induced a statistically significant increase of blood P, Cu and Se levels compared to these concentrations in the cows from the control groups (K). Besides, a decrease in the AST and CK activity was observed.