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Immature Wistar rats were induced to ovulate by treatment with PMSG and hCG. Control animals ovulated 43.5 +/- 0.36 ova/rat. Intraperitoneal injection of rotenone doses of 0.125, 0.25 and 0.50 mg/kg reduced the ovulation rate to 24.0 +/- 3.08, 8.0 +/- 0.88 and 1.5 +/- 0.44 ova/rat, respectively. The rotenone significantly reduced ovarian cytochrome oxidase activity and progesterone production, but not production of oestradiol or testosterone. Thyroxine treatment at a dose of 5 mg/kg s.c. reversed the rotenone inhibition of ovulation. The results suggest that an increase in mitochondrial respiration is an essential feature of the ovulation process in mammals.

Inhibition of ovulation in PMSG/hCG-treated immature rats by rotenone, a specific inhibitor of mitochondrial oxidation