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Ovarian function in the preovulatory rabbit.

Iv injections of 75 IU human chorionic gonadotropin were given to New Zealand white rabbits. Ovarian blood flow was measured by using the radiolabeled microspheres technique. Both ovarian veins were cannulated and peripheral blood was obtained simultaneously. Ovarian secretion of hormones was determined at hourly intervals for 9 hours. Ovarian vein plasma concentrations of 17beta-estradiol (E2) and testosterone (T) rose considerably by 2 hours. By 4 hours the secretion rate of E2 reached a 2nd peak. Secretion rates of estrone (E1) androstenedione (A) progesterone (P) and 20alpha-dihydroprogesterone (20alpha-OH-P) showed a peak only at the 4-hour period. Peripheral blood levels of E1 E2 and A were unchanged. A small rise in T between the 2nd-4th hours was noted. An increase in P was sustained from the 1st up to the 8th hour. 20alpha-OH-P was elevated from the 2nd to the 9th hour. Removal rate of HCG was most during the 2nd hour. Ovarian steroidogenesis seemed to be stimulated by HCG. Significant but brief rises in E2 and T production may serve an intraovarian function. Ovarian steroid production observed agrees with that which occurs shortly after mating in rabbits. Cellular binding sites may be involved.