[Control of puerperium in swine under conditions of extremely shortened nursing method. 1. Results of histological studies in postpartum involution and regeneration of the uterus under conditions of extremely shortened nursing period and medicamentous control of puerperium].

Uterus tissue samples were taken from 31 sows which had been under regimes of extremely shortened nursing periods and differentiated medication to control their puerperium. The samples were taken following laparotomy during the first postpartum oestrus as well as in subsequent phases of the cycle and histologically tested for puerperal involution and regeneration. The endometrium and myometrium of sows in oestrus were found to be in a condition which widely corresponded to normal oestrus condition of the uterus wall, when their piglets had been weaned in the third postpartum week. However, untreated sows in oestrus, whose piglets had been weaned extremely soon, that is in the second postpartum week, displayed numerous signs of inadequate postpartum involution and regeneration. Oxytocin was found to work well in speeding up regeneration of both the endometrium and myometrium. Intramuscular injection of twice nine International Units per die, from the first through ninth days postpartum, helped to complete largely all regeneration processes up to the first oestrus, when piglets had been weaned in the second postpartum week. Oral antibiotic medication (chlortetracycline) and parenteral application of vitamins failed to produce any substantive and histologically recordable effect on puerperal involution processes.