Specimen No. 040 · Terrestrial Mammal
Domestic Bull penis size & anatomy
Bos taurus
Reference measurement
Approx. 1.2 m / 3.9 ft
Approximate average
Veterinary ultrasonography reference describes mature bull penis as about 120 cm long.
Measurement source: Practical Atlas of Ruminant and Camelid Reproductive Ultrasonography (opens in a new tab)
Did you know?
A mature bull's penis is about 120 cm long and roughly 3–4 cm in diameter.
Source: Practical Atlas of Ruminant and Camelid Reproductive Ultrasonography (opens in a new tab)
The bull penis is fibroelastic, so it is relatively firm even when not erect.
Source: Practical Atlas of Ruminant and Camelid Reproductive Ultrasonography (opens in a new tab)
Bulls have a sigmoid flexure that straightens as the penis extends.
Source: Practical Atlas of Ruminant and Camelid Reproductive Ultrasonography (opens in a new tab)