Abstract
SUMMARY: A bioassay of gonadotrophin depending on the induction of ovulation in immature mice is described. Dose-response data to various preparations of gonadotrophin are examined. Results by this method in some instances contrasted more sharply with those of the ovarian augmentation assay for follicle-stimulating hormone than did the results of the assay for total gonadotrophin. The addition of prolactin, adrenocorticotrophic hormone and stilboestrol did not interfere with the assay.