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Activity of 3β-hydroxysteroid dehydrogenase in the postovulatory follicle of the domestic fowl (Gallus domesticus)

Summary. The activity of ⁵-3β-hydroxysteroid dehydrogenase (3β-HSD) in the postovulatory follicle (POF) of the domestic hen was studied; it declined rapidly during the first 15 h after ovulation and then fell gradually until 50 h when there was no detectable activity. Comparison of 3β-HSD and glucose 6-phosphate dehydrogenase activities in the theca and granulosa cells indicated that the changes in enzymatic activity can be attributed to the thecal component; the enzyme activity in granulosa cells was stable up to 35 h after ovulation.

The results appear consistent with the hypothesis that the POF is a source of steroid hormones.