Joffre M M, Joffre M J
C R Acad Hebd Seances Acad Sci D. 1975 Sep 22;281(12):819-21.
Plasma testosterone levels have been determined by radioimmunoassay on peripheral venous blood samples of young and adult foxes at different times of their genital activity. In the cub, the testosterone levels increase from November to January; at this time, the young is pubescent. In the adult, the testosterone levels are low from April to November. At this time, the levels increase and reach a maximum value from December to February, which is the mating season. Some high testosterone levels observed in summer prove that the endocrine activity of the testis persists during the out-breeding season.
已通过放射免疫分析法测定了幼年和成年狐狸在其生殖活动不同时期外周静脉血样本中的血浆睾酮水平。幼狐的睾酮水平从11月到1月升高；此时幼狐处于青春期。成年狐狸的睾酮水平在4月至11月较低。此时睾酮水平升高，并在12月至2月达到最大值，这是交配季节。夏季观察到的一些高睾酮水平表明，睾丸的内分泌活动在繁殖季节之外持续存在。
