Development of penis and sheath in the bull calf

Abstract

1. The penises of five bull calves were examined during the first year of life, using epidural anaesthesia or sedation with chlorpromazine hydrochloride.2. The process of separation between penis and sheath is described and data on age and weight of the calves are given.3. There was considerable variation in times and rates of development, but in general terms the penis began to separate from the sheath at about 4 months of age, and the process was completed at about 10 months.4. From the second to the sixth or seventh month of life the penises of these calves were short, and not manually protrusible.