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Ovarian tissue from immature rats treated with pregnant mare serum gonadotrophin (PMSG) or PMSG and human chorionic gonadotrophin was incubated in Medium 199. Stimulation of the formation of cyclic AMP in follicular and luteal tissue by terbutaline (10^–5 mol/l), a selective β₂-agonist, was blocked by butoxamine (10^–5 mol/l), a selective β₂-antagonist, whereas practolol (10^–5 mol/l), a selective β₁-antagonist, was ineffective. Propranolol (10^–5 mol/l), a non-selective β-antagonist, butoxamine nor practolol affected the increase in cyclic AMP promoted by the addition of 1 µg LH. Stimulation of the production of progesterone in both follicular and luteal tissue by terbutaline was blocked by butoxamine, but not by practolol. These findings indicated that β-adrenergic stimulation of ovarian cyclic AMP and progesterone is mediated by β₂-adrenergic receptors.

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