Effects of Pig Removal and Oxytocin Injections on Ovarian and Pituitary Changes in Mammillectomized Postpartum Sows

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Abstract
The effects of pig removal and oxytocin were determined in 42 primiparous sows, one-half of which had been mammillectomized at about 10 days of age. Pigs were removed on day 1 postpartum from sows assigned to those groups. Twenty USP units of oxytocin were injected intramuscularly every 2 hr. from day 1 until 2 hr. before slaughter on day 7. Sows with pigs present (averaged over both control and mammillectomized sows) had less follicular development than sows with pigs removed. Control sows, both saline and oxytocin injected, had less follicular development than mammillectomized sows in the pigs present groups. Control sows receiving oxytocin had more residual pituitary FSH than mammillectomized sows receiving oxytocin. Oxytocin injections depressed follicular fluid weight and number of large follicles in both control and mammillectomized sows if pigs were present, but not if pigs were removed. Uterine weight was depressed in control sows with pigs present as compared to mammillectomized sows with pigs present.

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