繁殖季節における雄猫の血中 androgen量および造精機能 Androgen concentration in the blood and spermatogenic function of tom cats during the breeding season.

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抄録

繁殖季節における雄猫の androgen分泌状況を明らかにするため, 末梢血中 testosterone (T)の日内変動, 精巣静脈血と末梢血中における androgen量 [androstenedione (A), 5α-dihydrotestosterone (DHT), T]の関係について観察した. また精巣の組織学的観察によって造精機能についても検討した. 実験には自然採光下の猫舎内で飼育されている年齢2-3才, 体重3.5-4.0kgの雄猫9頭を用いた. その結果, 雄猫の日内における末梢血中T量は, 個体によって大きく変動していたが, 一定の傾向は認められず, episodicな分泌であった. 精巣静脈血中における androgenは個体によってかなりの差が認められたが, 左右の間ではほ等しかった. また3種 androgen量は, それぞれ精巣静脈血と末梢血の間で相関関係が認められた(A:P<0.01, DHT:P<0.05, T:P<0.01). 精巣の組織所見は, いずれの猫においても活発な精子形成が認められ, 各個体間において精細管径および各種精細胞数にも有意差は認められなかった.

In order to better understand androgen secretion in the tom cat during the breeding season, observations of diurnal changes in peripheral blood testosterone (T) levels, were made and the relation between androgen levels (androstenedione (A), 5α-dihydrotestosterone (DHT), T) in testicular and peripheral vein blood was borne. Histologic examinations of the testis were also performed to investigate spermatogenic function. The 9 tom cats used in these studies were 2-3 years old, weighed 3.5-4.0kg, and were raised in a room under natural lighting. As a result, diurnal peripheral blood T levels in the tom cat fluctuated greatly according to each individual, but since no definite trend could be identified, secretion was determined to be episodic. Although fairly large differences in the 3 types of androgen were observed in testicular vein blood depending on the individual animal, levels on the left and right were almost equal. Moreover, a correlation was found between the testicular and peripheral vein blood concentrations of the 3 androgens (A: p<0.01; DHT: p<0.05; T: p<0.01). Therefore, secretion of testicular androgen can be inferred by measuring peripheral blood androgen levels. Testicular histological examination revealed active spermatogenesis in all of the cats, and no significant inter individual differences were detected in either seminiferous tubule diameters or any of the various germ cells.

収録刊行物

  • 日本獸醫學雜誌(The Japanese Journal of Veterinary Science)

    日本獸醫學雜誌(The Japanese Journal of Veterinary Science) 52(4), 801-806, 1990

    公益社団法人 日本獣医学会

キーワード

各種コード

  • NII論文ID(NAID)
    130003482465
  • 本文言語コード
    ENG
  • ISSN
    0021-5295
  • データ提供元
    J-STAGE 
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