EN
Sows during or just after parturition were injected the following preparates contracting uterus: group I — 217 sows, oxvtocin 0,06 mg; group II — 156 sows, hypophysin 50 J.V.; group III — 111 animals, hypophysin 20 j.V. Control group consistetd of 487 sows. In all experimental groups interparturient period was shortened by about 1—9 days camparing to controls. In group I percent of diarrhoeic piglets diminished by 33,3, losses lowered by 2,1%, incidence of diseases in sows lowered by 3,7%, and the number of sows active in a successive reproductive cycle increased by 2,4% comparing to controls. In groups I and II a mean number of progeny in a successive brood was significantly lower than that in control group. In group II percentage of sick sows lowered by 18,6% but number of moribund piglets and number of sows active in reproduction was comparable with controls. In group III a healthy state of sows and rearing of piglets were lower than in controls.