PHYSIOLOGY OF EGG EXTRUSION IN FEMALE XENOPUS FROG TEST FOR PREGNANCY11

Abstract

Injs. of chorionic gonadotrophic luteinizing hormones were found to produce oviposition in the mature [female] frog Xenopus laevis, Daud. (South African clawed frog) in much smaller doses and with greater speed than similar injections of the chorionic gonadotrophic follicle-stimulating hormones found in pregnant mares'' serum. The physiology of egg extrusion in the ? frog test for pregnancy is probably therefor based on the excess of the luteinizing hormones found in pregnancy urine.