Abstract
Summary
Rats were exposed to 1, 12, or 24 hr of light per day for two estrous cycles, then were mated. On Days 6, 7, or 8 following the appearance of sperm in the vaginal smear, the animals were anesthetized, injected with Indian ink to mark implantation sites, and killed. The number and diameter of implantation sites were recorded and the uteri weighed. Although short exposure to light had no effect on day of implantation, 11 of 21 animals failed to complete two normal estrous cycles. Animals exposed to continuous light showed delayed implantation.
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