USE OF HIGHLY PURIFIED PORCINE FSH PREPARATION FOR SUPEROVULATION IN JAPANESE BLACK CATTLE

Fifty cattle were divided into 3 groups (I, II, III) according to FSH- R dosage used to induce superovulation between days 9 and 11 of the es trous cycle. Ova/embryo recovery rate did not differ significantly bet ween groups I and II administered total dosages of 16 and 24 mg, respe ctively. However, the average number of recovered ova/embryos and tran sferable embryos was significantly lower in group III (administered a total dosage of 30 mg) (P<0.05) than groups I and II. These results su ggest that intramuscular administration of 16 mg FSH-R over 3 days is sufficient for inducing superovulation in Japanese Black cattle.