我が国で飼育されていたチーター(<i>Acinonyx jubatus</i>)の精液性状の評価 Evaluation of Semen Quality of Captive-living Cheetahs (<i>Acinonyx jubatus</i>) in Japan

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Abstract

国内の3施設で飼育されていた18頭の成熟雄チーターから,経直腸電気射精法で採取した31サンプルの精液の性状を分析した。なお18頭中13頭は,繁殖歴がなかった。18頭の雄の精液の性状は,精液量が0.91±0.11ml,精液pHが8.1±0.1,総精子数が32.6±5.4百万,生存精子率が84.9±1.9%,精子運動指数が53.7±3.8,形態異常精子率が66.1±3.4%,正常先体精子率が68.5±5.1%で,これらの値は,他のチーターにおける報告値の範囲内であった。繁殖歴がある雄とない雄の精液を比較したところ,先体正常精子率以外のパラメーターについては,両者間で有意な差はみられず,繁殖歴がない雄の正常先体精子率(59.8%)も致命的なほど低くはなかった。以上の結果から,飼育下の雄チーターにおける低受胎の主因が,精液性状の低さである可能性は少ないと考えられた。

Thirty-one ejaculates from 18 captive-living cheetahs (Acinonyx jubatus) maintained at three zoological institutions in Japan were collected by rectal probe electrostimulation, and evaluated. Thirteen of the males had no reproductive history. Semen characteristics (mean±SEM) recorded were as follows: semen volume, 0.91±0.11ml; semen pH, 8.1±0.1; total sperm count per ejaculate, 32.6±5.4 million; sperm viability, 84.9±1.9%; sperm motility index, 53.7±3.8; sperm abnormality, 66.1±3.4%; and percentage of sperm with a normal acrosome, 68.5±5.1%. These values were approximately in the range of the results reported in other cheetahs. These parameters, except for the percentage of sperm with a normal acrosome, were not significantly different between the fertile and subfertile males. The acrosomal integrity in the subfertile males (59.8%) was significantly lower than that in fertile ones (86.9%), but even the values in the former were not necessarily fatally low. This result indicates that their poor semen quality may not inhibit reproductive efficiency in captive male cheetahs in Japan.

Journal

  • Japanese Journal of Zoo and Wildlife Medicine

    Japanese Journal of Zoo and Wildlife Medicine 11(1), 25-30, 2006

    Japanese Society of Zoo and Wildlife Medicine

References:  29

Cited by:  3

Codes

  • NII Article ID (NAID)
    110004436688
  • NII NACSIS-CAT ID (NCID)
    AA11366156
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    1342-6133
  • Data Source
    CJP  CJPref  NII-ELS  J-STAGE 
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