title: Diurnal changes in peripheral melatonin concentration in goats and effects of light or dark interruption.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D003624:Darkness; D005260:Female; D006041:Goats / Q000502:physiology*; D008027:Light; D008550:Melatonin / Q000378:metabolism*
chemical_list: D008550:Melatonin