Continuous illumination and oogenesis in albino rabbits.

ABSTRACT

Photo periodism is probably a phenomenon of natural selection. The critical period of ovulation can be adjusted to the environmental condition such as exposure to continuous illumination (LL) at constant temperature. Many investigators have also observed that blindness in girls causes early menarche while opposite results are obtained in rats. The present study was based upon the changes in circadian rhythm of ovaries of albino rabbits, by exposing the animals to continuous illumination through an electric bulb of 100 watt kept at one metre distance, at 37 degrees C, vaginal smear showed constant estrus. It was observed that degenerative changes started appearing in the histology of ovaries from first week of experiment. Degenerative changes were gradual and led to complete metaplasia or atrophy of ovary.