Summary. The induction of superovulation was studied in thirteen calves 4 to 24 weeks of age. Multiple ovulations were induced by 2000 i.u. pms followed by an intravenous injection of either nih-lh or hcg. The ovulatory response was determined at laparotomy 48 to 64 hr after lh injection. Eleven of the calves showed 1 to 50 ovulation points. All levels of nih-lh produced satisfactory ovulatory responses. Recovery and fertilization rates of eggs were low.