A biological unit of androgenic activity, which is the masculinizing effect of a substance. Symbol, CU. One CU is the smallest amount of any substance having androgenic activity that, given on two successive days to a capon (a rooster whose testes have been removed), causes its comb to enlarge 20%.
The international unit of androgenic activity was abandoned in 1950. It equaled 0.1 mg of androsterone, which is roughly the activity of 1 capon unit.
K. Diem and C. Lentner, editors.
Documenta Geigy. Scientific Tables. 7th edition.
Ardsley, NY: Geigy Pharmaceuticals, 1970.
Page 751.
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