Abstract
The male reproductive cycle in the European wild boar ( Sus scrofa) was characterized in free-ranging and captive animals. Puberty is attained at 10 months of age when testis weight averages 53 g. Thereafter, the sexual function follows a clearly marked seasonal pattern. In mature animals, testicular weight and related plasma testosterone levels were significantly higher in winter than during the summer months. These variations parallel the seasonal sexual activity of females. The results are discussed with emphasis on the possible role of daylength in seasonal changes of testicular function.
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