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University of Missouri,2, Columbia 65211 and U.S. Department of Agriculture,3, Clay Center, NE 68933
Abstract
The effects of unilateral ovariectomy on ovarian compensatory hypertrophy (OCH), endocrine profiles and the pituitary response to gonadotropin releasing hormone (GnRH) were studied in 46 multiparous suckled sows. On d 20 of lactation (d 0 of experiment), sows were subjected to sham ovariectomy (Sham; n = 23) or unilateral ovariectomy (ULO; n = 23). On d 1 (n = 16), 2 (n = 15) or 8 (n = 15) following initial surgery the remaining ovaries in both Sham and ULO sows were removed. Immediately following removal of the remaining ovaries, GnRH (10 µg) was administered to each sow. Peripheral blood samples were taken every 10 min for 80 min beginning 20 min prior to GnRH administration. No difference in ovarian weight was observed between ULO and Sham sows until d 8, when ovarian weight was greater (P<.05) for the remaining ovary from ULO sows (3.96 ± .21 vs 5.91 ± .39 g). Ovarian follicular fluid weights from ULO sows were greater (P<.05) than Sham sows on both d 2 and 8. On d 1, plasma concentrations of follicle stimulating hormone (FSH) were greater (P<.05) in ULO sows than in Sham sows (2.9 ± .2 vs 2.1 ± .1 ng/ml). Plasma FSH concentrations, however, did not differ between Sham and ULO sows on either d 2 or 8. Ovarian venous concentrations of estradiol-17β were also greater (P<.05) in ULO sows compared with Sham sows on d 2 but not d 8. Treatment mean differences for both plasma concentrations of luteinizing hormone (LH) and the pituitary LH response to GnRH were not significant. No difference in pituitary FSH response to GnRH was observed between ULO and Sham sows on either d 1 or 2 following initial surgery. However, Sham sows released more (P<.05) FSH than ULO sows on d 8. These results indicate that OCH was evident in the suckled sow by 2 d after ULO. Furthermore, OCH was characterized by an acute, but shortlived, increase in plasma concentrations of FSH and ovarian venous concentrations of estradiol-17β.
1 Contribution from the Missouri Agr. Exp. Sta. Journal Series No. 9761.
3 Roman L. Hruska U.S. Meat Anim. Res. Center, ARS.
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