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Biology of Reproduction, Vol 14, 314-316, Copyright © 1976 by Society for the Study of Reproduction
1 Worcester Foundation for Experimental Biology,
Shrewsbury, Massachusetts 01545 The possibility of delayed implantation in prepuberal rats treated with gonadotrophins was
examined. They were injected with 8, 10 or 12 IU PMS at 29 or 30 days of age, followed 52 h later
by 1.0 or 1.2 IU HCG, and allowed to mate. On Day 7 of pregnancy (Day 1 = sperm in the vagina)
all rats which had been injected with 8 IU PMS at 30 days (followed by HCG) showed normal
implantation; while in the other groups, normal implantation occurred in 33 to 71 percent of the
rats, with the remaining in delayed implantation.
Note:
ACKNOWLEDGMENT
This study was supported by a grant (HD 03003)
from the National Institute of Child Health and
Human Development, NIH, and a grant from the Ford
Foundation, both awarded to Dr. M. C. Chang, whose
interest in this study was greatly appreciated.
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