Natha LilitVernon L. YeagerMahidol UniversitySt. Louis University2018-04-192018-04-191974-01-01Proceedings of the Society for Experimental Biology and Medicine. Vol.145, No.3 (1974), 894-89615353699003797272-s2.0-0015976846https://repository.li.mahidol.ac.th/handle/20.500.14594/10610Rats 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. © 1974, SAGE Publications. All rights reserved.Mahidol UniversityBiochemistry, Genetics and Molecular BiologyArticleSCOPUS10.3181/00379727-145-37918