Abstract
Pyruvate, lactate and lactate dehydrogenase appeared linearly in 2 ml 0.9% NaCl recirculated through the rabbit oviduct for 4 h in vivo. In oviducts from rabbits injected 3 days previously with 100 IU hCG [human chorionic gonadotropin], the rate of appearance of all 3 constitutents was considerably reduced. The lactate dehydrogenase secreted evidently does not bring about the interconversion of pyruvate and lactate in the oviduct lumen.