Bovine Testicles

Some articles on testicle, bovine testicles:

Testosterone - History
... consisting of an extract of dog and guinea pig testicle ... Koch, established easy access to a large source of bovine testicles—the Chicago stockyards—and to students willing to endure the ceaseless toil of extracting their isolates ... derived 20 mg of a substance from a supply of 40 pounds of bovine testicles that, when administered to castrated roosters, pigs and rats, remasculinized them ...