The study was carried out on 120 sows divided into two groups comprising 80 animals in the experimental group and 40 in the control. The sows of the experimental group were given Ursoselevit at a dose of 1 ml per 20 kg of body weight at week 5 and 3 before parturition. In control sows no drugs were applied. It was found that morbidity of sows due to the MMA syndrome decreased after Ursoselevit administration. The drug had a beneficial influence on the fertility of sows. It also diminished the frequency of diarrhoea occurrence and the number of death in piglets coming from sows which had received the drug.