Ovarian Steroids in the Uterine Lumena. I. Effect of LH Injection and Mating in Rabbits1

Abstract
Estrogen (E) and progestin (P) were determined in the uterine flushings, esophageal flushings, and peripheral plasma in rabbits at 0 (control), 1, 2, 4, 12, 24, 72 and 168 h after LH (10. µg/kg) injection or after mating. In general, significant quantities of E and P were found in the uterine flushings and in the peripheral plasma. In contrast, esophageal flushings contained significantly lower concentrations of P than that found in the uterine flushings, while E was nondetectable.