Different Photoperiodic Responses in Four Lines of Japanese Quail

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  • Atsumi Yusuke
    Laboratory of Animal Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Japan Avian Bioscience Research Center, Graduate School of Bioagricultural Sciences, Nagoya University, Japan
  • Yorinaga Eriko
    Laboratory of Animal Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Japan
  • Ota Wataru
    Laboratory of Animal Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Japan
  • Yoshimura Takashi
    Laboratory of Animal Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Japan Avian Bioscience Research Center, Graduate School of Bioagricultural Sciences, Nagoya University, Japan Institute of Transformative Bio-molecules (WPI-ITbM), Nagoya University, Japan Division of Seasonal Biology, National Institute for Basic Biology, Japan

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Organisms measure day length to better adapt to seasonal changes in the environment; this phenomenon is called photoperiodism. The Japanese quail has a highly sophisticated photoperiodic mechanism and is an excellent model for the study of photoperiodism. Various lines of quail have been established during the domestication process. In the present study, we examined the effect of long day (LD) followed by short day (SD) on testicular weight in four lines of quail (L, AMRP, NIES-Br, and WE). When the quail were raised under SD conditions, testicular development was suppressed in all examined lines. The speed of the LD-induced testicular development of NIES-Br line was faster than that of AMRP line, while the speed of the SD-induced testicular regression of L line was significantly faster than that of WE line. These quail lines provide excellent model to uncover the underlying mechanism of seasonal testicular regression.

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