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Ovarian and Pituitary Gland Changes in Hysterectomized Postpartum Sows Treated with FSH snd Oxytocin¹

University of Wisconsin, Madison

Abstract

The effects of suckling, pig removal, and pig removal plus oxytocin injections were studied in 36 hysterectomized and sham-operated primiparous sows of the Yorkshire and Duroc breeds. Ten USP units of oxytocin were injected intramuscularly every 2 hr. beginning on day 6 and continuing until 2 hr. before slaughter on day 13. Surgery was performed and pigs were removed from sows assigned to those groups on day 6. Suckled sows had less (P<.01) follicular development and more (P<.01) residual pituitary FSH activity than either nonsuckled or nonsuckled plus oxytocintreated sows. Yorkshire sows had more (P<.01) residual pituitary FSH activity than did Duroc sows. Oxytocin injections had no significant effect on ovarian or pituitary measurements either in hysterectomized or sham-operated nonsuckled sows when compared to sows with only pigs removed.

In a second experiment, 28 second-litter Yorkshire sows were used to study the effects of hysterectomy on the response of sows to 20 mg. of FSH per day on days 8 through 11 postpartum. Surgery was performed on day 6 and the sows were slaughtered on day 13. FSH injections produced more (P<.01) ovulations in sham-operated than in hysterectomized sows. FSH also increased (P<.01) follicular fluid weight in both hysterectomized and sham-operated sows. There were no significant effects of FSH injections or hysterectomy on pituitary gonadotropin measurement.

¹ Paper No. 1154 from the Genetics Laboratory and No. 480 from the Department of Meat and Animal Science. Published with the approval of the Director of the Agricultural Experiment Station. This work was supported in part by the Ford Foundation, Grant No. 63-505 and by Public Health Service Training Grant No. 5TO1 HD00104-01 from the National Institute of Child Health and Human Development.