title: Photoperiodic control of the cloacal gland of the Japanese quail.
abstract: 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.
authors.forename: B D
authors.initials: BD
authors.lastname: Sachs