Abstract: Fourty-three male raccoon dogs were elected by author．The seasonal change of testis width and serum testosterone level were determined from 1987 to 1988． The results showed that testis width and serum．testosterone level presented marked seasonal variation (P< 0.01)．Tesfis width started to increase evidently at Autumnal equinox (P< 0.05)．Serum testosterone level began to rise evidently in October (P<0.05)．The monthly average serum testosterone level and the average testis width showed marked positive correlation (r=0.83 , P< 0.01，n=11)．The serum testosterone level in brooding season ana the date of first and last mating of males showed noticeable negative correlation (r= -0.525 and r= -0.476 respectively，P< 0.05，n=19)．

Key words: Racco on dog (Nyctereutes procyonoides), Serum testosterone, Testis, Reproduction

摘要： 作者测定并分析了43只雄貉睾丸宽度，血清睾酮水平的季节性变化。结果表明：睾丸宽度和血清睾酮7水平呈明显的年周期季节性变化(p<0.01)。秋分(9月)时， 睾丸宽度开始增大(p<0.O5)；血清睾酮水平在10月开始升高(p<0.O5)。各月雄貉的平均睾酮水平与平均皋丸宽度呈极显著的正相关(r=0.83，p<0.01,n=11)。

关键词: 貉, 血清睾酮, 睾丸, 繁殖