, Volume 45, Issue 1, pp 102–103 | Cite as

Effects of photoperiod, temperature and testosterone-treatment on plasma T3 and T4 levels in the Djungarian hamster,Phodopus sungorus

  • A. Masuda
  • T. Oishi
Short Communications


The effects of photoperiod, temperature and testosterone treatment on plasma T3 and T4 levels were investigated in the Djungarian hamster. Plasma T3 level was affected by temperature (25°C<7°C) but not by photoperiod. Plasma T4 level was affected by photoperiod (short day < long day) at 25°C. Administration of testosterone increased plasma T4 level under short photoperiod at 25°C. Thus, higher plasma T4 level under long photoperiod at 25°C might be induced by testosterone.

Key words

Djungarian hamster photoperiod temperature T3 T4 testosterone 


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Copyright information

© Birkhäuser Verlag 1989

Authors and Affiliations

  • A. Masuda
    • 1
    • 2
  • T. Oishi
    • 1
    • 2
  1. 1.Department of Human Life and Environmental ScienceGraduate Division of Human CultureNaraJapan
  2. 2.Department of Biology, Faculty of ScienceNara Women's UniversityNaraJapan

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