J. Anim Sci.
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J. Anim Sci. 1969. 28:537-541.
© 1969 American Society of Animal Science
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Effects of Pig Removal and Oxytocin Injections on Ovarian and Pituitary Changes in Mammillectomized Postpartum Sows1

J. B. Peters, N. L. First and L. E. Casida

University of Wisconsin, Madison

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.

Footnotes

1 Paper No. 1266 from the Genetics Laboratory and No. 534 from the Department of Meat and Animal Science. Published with the approval of the Director of the Research Division, College of Agricultural and Life Sciences. This work was supported in part by the Ford Foundation, Grant Number 63-505 and by the Program Project in Genetics, Grant Number GM 15422 from National Institute of Health.






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Copyright © 1969 by the American Society of Animal Science.