title: Extraretinal photocontrol of reproductive responses of Leghorn hens to photoperiods of different length and spectrum.
mesh_terms: D000818:Animals; D002645:Chickens / Q000502:physiology*; D002940:Circadian Rhythm; D003624:Darkness; D004531:Eggs; D004780:Environment, Controlled; D005260:Female; D008027:Light; D010786:Photoreceptor Cells / Q000502:physiology; D010870:Pineal Gland / Q000502:physiology; D012098:Reproduction; D012160:Retina / Q000502:physiology