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Biology of Reproduction, Vol 13, 576-580, Copyright © 1975 by Society for the Study of Reproduction

Intensity of Continuous Light: Threshold Lower for Persistent Estrus than for Retinal Degeneration

HELEN H. LAMBERT 1

1 Department of Biology, Northeastern University, Boston, Massachusetts 02115


Female albino rats were exposed for 10 weeks to white continuous light (LL) at incident intensities from <5 µw/cm2 to 500 µw/cm2 (approximately 1 to 150 foot-candles). Intensities of 500 or 100 µw/cm2 of LL induced severe degeneration of retinal receptors, along with prolonged vaginal cornification and reduced ovarian weight as compared to rats kept in periodic lighting. Intensities of <5 or 25 µw/cm2 also significantly prolonged estrus and reduced ovarian weight; at these levels of LL no retinal pathology was apparent with the light microscope.

Submitted on April 21, 1975
Accepted on September 12, 1975




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