EN
The purpose of the study was to assess the effect of Uterotonic-Polfa on the results of fertility of adult and young sow and the number of piglets born by these females. The examinations were carried out on 243 females which had been divided into two groups: group I - 125 animals including 111 multiparous sows and 14 primaparous animals aged approximately 8 months. They were given Uterotonic-Polfa once at the rate of 50 mg of propranolol i.m. at 3-4 hours before insemination. Group II - 118 females including 104 multiparous animals and 14 young sows aged approximately 8 months, weighing about 120 kg served as a control group. Insemination was carried out by 100 ml of semen at the concentration of 3-3.5 mid of Spermatozoons in the period of sexual toleration. It was found out that in group I the number of sows which had given birth was 3.55% higher than that in the control group. The use of the drug increased the number of live new-born piglets by 2.09% as compared with the control. In primaparous sows the number of deliveries was up to 14.24% higher than that in controls; however, the mean number of piglets born in a litter was only higher by 0.73 Uterotonic-Polfa administered before coition or insemination had a beneficial effect on the improvement of fertility and cropping power.