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Biology of Reproduction, Vol 13, 298-303, Copyright © 1975 by Society for the Study of Reproduction

Time of Implantation in the Mongolian Gerbil (Meriones unguiculatus) and Its Hormonal Requirements

J. T. WU 1

1 Worcester Foundation for Experimental Biology Shrewsbury, Massachusetts 01545


When cyclic Mongolian gerbils were mated, the uterine blueing reaction indicative of initial implantation interaction between the blastocyst and uterus was first detected at 2100 h of Day 6; while the invasion of uterine epithelium by the blastocyst was observed the next morning. Implantation, therefore, occurs on Day 7.

Hormonal requirements for implantation was studied by ovariectomy and replacement therapy. It was found that both estrogen and progesterone were required for implantation in gerbils ovariectomized before 1300 h of Day 5, but only progesterone was required when they were ovariectomized after 2100 h of the same day. It appears that estrogen sufficient for implantation is secreted before 2100 h of Day 5.

 Submitted on March 14, 1975
Accepted on June 4, 1975






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Copyright © 1975 by the Society for the Study of Reproduction.