Response of the chicken pineal gland, blood and reproductive organs to darkness.
D000818:Animals; D001769:Blood; D002645:Chickens / Q000502:physiology*; D003624:Darkness; D005260:Female; D008027:Light; D009929:Organ Size; D010053:Ovary; D010057:Oviducts; D010870:Pineal Gland / Q000502:physiology*