EN
The examination have been undertaken in order to determine the influence of avoparcin given to cows during high pregnancy and early lactation on their health, fertility and milk yields. The data were assessed in relation to the indices of lipid metabolism. The studies included 120 cows divided into two groups, i.e. the experimental one and the control. The experimental group was given avoparcin to the fodder at the dose of 100 mg per one animal per 24 hours for 4 weeks prior to parturition and 100 days after it. The control group was similarly fed but without avoparcin. The results obtained revealed that the addition of avoparcin influenced the liver activity as a stabilizer of lipid metabolism especially before parturition. No side effects were observed. Under such conditions better milk yields and reproduction performance were noticed.