Incidence of Ovulation without Coital Stimuli in Captive Japanese Black Bears (Urus thibetanus japonicus) based on Serum Progesterone Profiles

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  • OKANO Tsukasa
    United Graduate School of Veterinary Sciences, Gifu University
  • NAKAMURA Sachiko
    United Graduate School of Veterinary Sciences, Gifu University
  • NAKASHITA Rumiko
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology
  • KOMATSU Takeshi
    The Institute of Japanese Black Bear in Ani
  • MURASE Tetsuma
    United Graduate School of Veterinary Sciences, Gifu University Laboratory of Theriogenology, Faculty of Applied Biological Sciences, Gifu University
  • ASANO Makoto
    United Graduate School of Veterinary Sciences, Gifu University Laboratory of Zoo and Wildlife Medicine, Faculty of Applied Biological Sciences, Gifu University
  • TSUBOTA Toshio
    United Graduate School of Veterinary Sciences, Gifu University Laboratory of Zoo and Wildlife Medicine, Faculty of Applied Biological Sciences, Gifu University

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Other Title
  • 飼育下ニホンツキノワグマ(Ursus thibetanus japonicus)における血清中プロジェステロン濃度に基づいた交尾刺激なしでの排卵の発生
  • Incidence of Ovulation without Coital Stimuli in Captive Japanese Black Bears (Ursus thibetanus japonicus) based on Serum Progesterone Profiles

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Abstract

The purpose of this study was to ascertain whether or not Japanese black bears (Ursus thibetanus japonicus) are induced ovulators. The progesterone levels of female bears kept with a male and allowed to mate (n=2) and female bears allowed contact with a male through bars but not allowed to mate (n=6) during the mating season increased significantly in late October. Based on this result, the female bears were considered to have ovulated. Females isolated from males (n=3) were ovarioectomized after the mating season, and no corpora lutea were observed, indicating they had not ovulated. These findings suggest that Japanese black bears may be induced ovulators that ovulate with stimuli from males and without coitus at a high rate.<br>

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