Effects of photoperiod, temperature and testosterone-treatment on plasma T3 and T4 levels in the Djungarian hamster, Phodopus sungorus.
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 degrees C less than 7 degrees C) but not by photoperiod. Plasma T4 level was affected by photoperiod (short day less than long day) at 25 degrees C. Administration of testosterone increased plasma T4 level under short photoperiod at 25 degrees C. Thus, higher plasma T4 level under long photoperiod at 25 degrees C might be induced by testosterone.
Masuda
A
A
Department of Human Life and Environmental Science, Faculty of Science, Nara Women's University, Japan.
Oishi
T
T
D000818:Animals; D006224:Cricetinae; D008027:Light; D008297:Male; D010507:Periodicity; D013696:Temperature; D013739:Testosterone / Q000494:pharmacology*; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
D014284:Triiodothyronine; D013739:Testosterone; D013974:Thyroxine