title: Circadian clock determines the timing of rooster crowing.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Shimmura
authors.forename: Takashi
authors.initials: T
authors.lastname: Yoshimura
mesh_terms: D000818:Animals; D002645:Chickens / Q000502:physiology*; D057906:Circadian Clocks / Q000187:drug effects; D002940:Circadian Rhythm / Q000187:drug effects; D008297:Male; D009919:Orchiectomy / Q000662:veterinary; D043343:Testosterone Propionate / Q000008:administration & dosage; D014743:Videotape Recording; D014828:Vocalization, Animal / Q000187:drug effects
chemical_list: D043343:Testosterone Propionate