EFFECTS OF HUMAN MENOPAUSAL GONADOTROPIN (HMG) FOR SUPEROVULATION IN JAPANESE BLACK CATTLE

Sixty-four Japanese Black parous cows were divided into 5 dosage group s (I, II, III, IV, V) and administered either human menopausal gonadot rophin (hMG) or FSH by intramuscular injection. No significant differe nces were observed between the hMG-treated groups. The average number of recovered ova/embryos in cows treated with 900 IU was significantly greater (P<0.05) than in cows treated with FSH. The percentage of hig h-quality transferable embryos was highest in the 600 IU hMG-treated g roup. Also, FSH-treated cows produced a significantly larger number of unfertilized ova compared to hMG-treated cows. The results suggest th at hMG treatment is sufficient for Japanese Black Cattle at a dose of 600 IU for 3 days, and that a 2-day treatment regime is also possible.