title: Testicular metamorphosis rates in European starlings maintained under short daily photophases.
mesh_terms: D000818:Animals; D001717:Birds / Q000502:physiology*; D002940:Circadian Rhythm; D008027:Light; D008297:Male; D013091:Spermatogenesis; D013737:Testis / Q000502:physiology*; D013997:Time Factors