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Biology of Reproduction, Vol 23, 394-397, Copyright © 1980 by Society for the Study of Reproduction

Myometrial Activity and the Distribution of Blastocysts in the Uterus of the Rat: Interference by Relaxin

JOHANNA PUSEY 1, W. A. KELLY 1, JANE M.C. BRADSHAW 1, , and D. G. PORTER 1

1 Department of Anatomy, The Medical School, University of Bristol, Bristol BS8 1TD, England


Intravenous infusion of porcine relaxin (1700 h on Day 4 to 0900 h on Day 5), during the period when blastocysts are transported into and throughout the uterine horn in rats, disorganized the even distribution of ova among cranial, mid, and caudal thirds of the uterus normally seen on the morning of Day 5. This appeared to be due to inhibition of the myometrium rather than to an interference in other postulated mechanisms of spacing, because after cessation of the relaxin infusion at 0900 h (Day 5) the blastocysts were redistributed uniformly among the thirds of the uterus before implantation (p.m., Day 5). These data provide evidence that the propulsion of blastocysts through the uterus in the rat at least initially is accomplished by myometrial activity.

Note:
ACKNOWLEDGMENTS We are grateful to Dr. Sandra J. Downing for assistance with the cannulations and to Dr. Bent G. Boving for helpful criticism of the manuscript.

Submitted on April 8, 1980
Accepted on June 25, 1980




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