飼育下の雌ユキヒョウ(<i>Uncia uncia</i>)1頭と雌チーター(<i>Acinonyx jubatus</i>)1頭における性行動と糞中エストロゲン動態の関係(繁殖学) Relationship between Sexual Behaviors and Fecal Estrogen Levels in a Female Snow Leopard (<i>Uncia uncia</i>) and a Female Cheetah (<i>Acinonyx jubatus</i>) under Captivity

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Abstract

飼育下の雌ユキヒョウ(Uncia uncia)と雌チーター(Acinonyx jubatus)における性行動と発情ホルモンの関係を調べる目的で,週に2〜7回の頻度で,同一日に行動観察と採糞を行った。糞中エストロゲン(E)濃度はエンザイムイムノアッセイによって測定し,ユキヒョウでは25項目の行動の回数を,チーターではRollingについてのみ回数を記録した。その結果,ユキヒョウでは,糞中E濃度との間に有意な正の相関関係が見られた行動は,Locomotion(r_s=0.4305, P<0.01),Flehmen(r_s=0.3905, P<0.01),Sniffing(r_s=0.3588, P<0.01),Rubbing(r_s=0.2988, P<0.01),Lordosis(r_s=0.2621, P<0.01),Pace(r_s=0.2335, P<0.01),Rolling(r_s=0.2285, P<0.01),Prusten(r_s=0.2216, P<0.01),Spraying(r_s=0.1876, P<0.01),Pursuing(r_s=0.1793, P<0.01),Attacking(r_s=0.1732, P<0.05)およびApproaching(rs=0.1423,P<0.05)の12項目であった。また糞中E値とこれらの行動の頻度は,共に季節的に変動し初冬から晩春にかけて高値を示した。チーターでも,糞中Eのピーク日やその直前にRollingが頻発し,両者の間には有意な正の相関関係が認められた(r_s=0.2714, P<0.05)。以上の結果から,飼育下の雌ユキヒョウと雌チーターにおいて,発情ホルモン動態と関連したこれらの行動を観察することで,適切な交尾のタイミングを予測できる可能性が示唆された。

We conducted concurrent behavioral observations and fecal collections 2-7 times a week to examine the relationship between ovarian hormones and sexual behaviors in a captive female snow leopard (Uncia uncia) and a cheetah (Acinonyx jubatus). The fecal samples were analyzed by enzyme immunoassay for estrogen levels. We recorded 25 behavior types in the snow leopard, but only one in the cheetah. In the snow leopard, highly significant (P<0.01) Spearman rank-order correlations with fecal estrogen levels were obtained in 12 behavior types such as Locomotion (r_s=0.4305), Flehmen (r_s=0.3905), Sniffing (r_s=0.3588), Rubbing (r_s=0.2988), Lordosis (r_s=0.2621), Pace (r_s=0.2335), Rolling (r_s=0.2285), Prusten (r_s=0.2216), Spraying (r_s=0.1876) and Pursuing (r_s=0.1793), whereas significant (P<0.05) correlations were obtained in Attacking (r_s=0.1732) and Approaching (r_s=0.1423). Both fecal estrogen levels and frequencies of these behaviors in the snow leopard fluctuated seasonally, and peaked during the early winter to late spring breeding season. In the cheetah, Rolling was observed just prior to or during the fecal estrogen peaks, and was significantly correlated to the fecal hormone level (r_s=0.2714, P<0.05). The results suggest that the observation of sex-related behaviors would be useful in predicting optimum mating time in captive snow leopards and cheetahs.

Journal

  • Japanese Journal of Zoo and Wildlife Medicine

    Japanese Journal of Zoo and Wildlife Medicine 14(1), 59-66, 2009

    Japanese Society of Zoo and Wildlife Medicine

References:  35

Codes

  • NII Article ID (NAID)
    110007225782
  • NII NACSIS-CAT ID (NCID)
    AA11366156
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    1342-6133
  • Data Source
    CJP  NII-ELS  J-STAGE 
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