Stable daily light regimens as inductive factors of endogenous testicular cycles in the European starling, Sturnus vulgaris.
D000818:Animals; D001699:Biometry; D001717:Birds / Q000502:physiology*; D002940:Circadian Rhythm; D003624:Darkness; D008027:Light; D008297:Male; D012726:Sexual Behavior, Animal / Q000502:physiology; D013737:Testis / Q000033:anatomy & histology*