Photoperiodic Control of the Cloacal Gland of the Japanese Quail

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Science  14 Jul 1967:
Vol. 157, Issue 3785, pp. 201-203
DOI: 10.1126/science.157.3785.201


Changes in photoperiod cause correlated changes in testes, cloacal glands, cloacal foam, and reproductive behavior of male Japanese quail. The cloacal protrusion may serve as a convenient external index of androgen, permitting repeated measurement without operation on or killing of the animal.