EN
In this work level of magnesium and some lipid compounds: total lipids, triglycerides, cholesterol with its fractions / HDL and LDL cholesterol / in blood serum of cattle in dependence of the age and physiologycal condition of organism was investigated. Obtained results allow to ascertain that the age of animals, final gestation or period of intensive lactation have statistically essential effect/ P i 0,01 / on level of compounds under discussion. Also connection with content of magnesium and level of some lipid compounds in blood serum of investigated animals was observed.