Interaction of Environmental Lighting, Age, and Genetic Background Influencing the Estrous Cycle

  • John W. Everett
Part of the Monographs on Endocrinology book series (ENDOCRINOLOGY, volume 32)


An outstanding characteristic of the DA strain and its fertility problem was the suspension of cyclic estrus early in adult life among segregated females and replacement of cycles by more or less continuous vaginal cornification. This persistent vaginal “estrus” when well established was associated with the presence in the ovaries of prominent vesicular follicles and the absence of corpora lutea. Cycling DA females also rapidly developed the condition when exposed to continuous illumination. In addition, there were certain seasonal influences relating to the length of daily illumination as detailed below.


Estrous Cycle Environmental Lighting Continuous Illumination Vaginal Smear Prolonged Estrus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • John W. Everett
    • 1
  1. 1.Department of NeurobiologyDuke University Medical CenterDurhamUSA

Personalised recommendations