Effects of photoperiod,temperature and testosterone-treatment on plasma T3 and T4 levels in the Djungarian hamster,Phodopus sungorus |
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| Authors: | A. Masuda T. Oishi |
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| Affiliation: | (1) Department of Human Life and Environmental Science, Graduate Division of Human Culture, Kitauoyanishi-machi, 630 Nara, Japan;(2) Department of Biology, Faculty of Science, Nara Women's University, Kitauoyanishi-machi, 630 Nara, Japan |
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| Abstract: | ![]()
Summary 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. |
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| Keywords: | Djungarian hamster photoperiod temperature T3 T4 testosterone |
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