Effects of Photic History and Illuminance Levels on Male Golden Hamsters

Roger A. Hoffman, Lucinda B. Johnson

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Four‐week‐old male hamsters, born and raised in total darkness or in LD 14: 10 (hr) were exposed to several low levels of illumination for 14 weeks. Analyses showed that testicular weights were significantly affected by both photic history and illuminance levels. Animals born in the dark possessed larger testes than those born in LD cycles and, further, displayed less responsiveness to levels of illumination below those required to suppress pineal function. While gonadal responses to photic duration may be said to be “all or none,” those resulting from insufficient illuminance levels are seemingly graded. Thus, the pineal gland may act indirectly as a photodosimeter at low illuminance levels.

Original languageEnglish (US)
Pages (from-to)209-215
Number of pages7
JournalJournal of Pineal Research
Issue number3
StatePublished - Jul 1985
Externally publishedYes


  • gonads
  • hamster
  • illuminance level
  • photic history
  • pineal


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