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EFFECTS OF AVIAN AND MAMMALIAN PITUITARY PREPARATIONS ON INDUCTION OF OVULATION IN THE DOMESTIC FOWL, GALLUS DOMESTICUS

Summary.: Fowl and mammalian pituitary preparations were injected intraperitoneally into hens (`ovulation-suppressed' following pretreatment with daily subcutaneous injections of PMSG) to determine their ovulation-inducing activities. Acetone-dried fowl (Gallus domesticus) and bovine anterior pituitaries (CAP and BAP), partially purified DEAEand CM-fractions prepared from CAP and CAP homogenate, and ovine NIH-FSH and -LH were used as the test preparations.

Acetone-dried CAP induced multiple ovulations from three to five follicles in the ovulation-suppressed hens pretreated with PMSG, whereas no ovulation occurred after the injection of BAP. The DEAEfraction exhibited about the same activity as the CAP homogenate in the induction of multiple ovulations from three to six follicles, but the activity of the CM-fraction was considerably lower than that of the CAP homogenate and DEAE-fraction. Ovine FSH did not induce ovulation, whilst a single injection of ovine LH resulted in ovulations from one to three follicles. The number of ovulating follicles induced by the preparations originating from CAP was significantly more than that induced by ovine LH.