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Biology of Reproduction, Vol 18, 105-109, Copyright © 1978 by Society for the Study of Reproduction

Effect of Resection of the Ampullary-Isthmic Junction on Estrogen Induced Tubal Locking of Ova in the Rabbit

C. A. EDDY 1, J. P. BALMACEDA 1, , and C. J. PAUERSTEIN 1

1 Departments of Obstetrics and Gynecology and Physiology, Center for Research and Training in Reproductive Biology and Voluntary Regulation of Fertility, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, Texas 78284


Estrogen induced retardation of tubal ovum transport was examined in rabbits using microsurgical techniques. Rabbits underwent unilateral microsurgical transection or resection of the ampullary-isthmic junction of the oviduct (AIJ) followed by microsurgical end-to-end tubal anastomosis. Neither treatment interfered with the ability of 250 µg depo estradiol given at the time of hCG administration to retard tubal ovum transport. Mean ovum recovery rates of 85 to 97% were obtained. All ova were located within or in close proximity to the AIJ or anastomosis site in all animals 72 h post hCG, estrogen administration. It is concluded that estrogen retards transport in the rabbit by acting upon the tubal isthmus rather than through selective action upon the AIJ.

Submitted on June 15, 1977
Accepted on July 18, 1977




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Copyright © 1978 by the Society for the Study of Reproduction.