雄馬の血中テストステロンとジヒドロテストステロンの日内変動ならびに24時間平均濃度に対する年齢と季節の影響

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  • Effects of Age and Season on Diurnal Variation and 24 Hour Mean Concentrations of Plasma Testosterone and Dihydrotestosterone in Stallions
  • オスウマ ノ ケッチュウ テストステロン ト ジヒドロテストステロン ノ ニチ

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Summary. Blood samples were taken from 22 stallions at hourly intervals for a 24-h period in all seasons, and plasma testosterone (T) and dihydrotestosterone (DHT) were measured by RIA. The stallions aged 11-17 (11-17 year old group) showed a biphasic diurnal variation in T in all seasons. The first peak appeared in the daytime and the second peak, at night. The time of the first peak was correlated with sunrise (r=0.69; P<0.05). DHT remained low and no peaks could be detected. For stallions aged 20-21 (20-21 year old group) no distinct biphasic shifts in T could be detected. The 24-h mean concentrations of T and DHT in the 11-17 year old group were highest in the summer and lowest in the fall (T, P<0.01; DHT, P<0.05), but that of T in the 20-21 year old group was highest in the spring and lowest in the fall (P<0.05). When T 24-h mean concentrations of the groups in the same season were compared, significant differences were noted for the summer (P<0.05), but not in any other season. It is concluded that in stallions, diurnal variation and 24-h mean concentration of T are affected by age and season.

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