title: A lack of fluctuation in xanthophyll concentrations in blood in laying hens at night and absence of pigmentation rings in the yolk.
abstract: Alternate white and yellow layers in the yolk are described in most textbooks. However, it was impossible to distinguish the presence of these layers when hard-cooked yolks from hens fed commercial type diets were examined. Serum xanthophyll concentrations were measured at different times during a 24-h period. Concentrations did not vary significantly due to time of day.
authors.affiliation: Department of Poultry Science, University of Florida, Gainesville 32611.
authors.forename: D S
authors.initials: DS
authors.lastname: Nelson
authors.forename: D M
authors.initials: DM
authors.lastname: Janky
authors.forename: R H
authors.initials: RH
authors.lastname: Harms
mesh_terms: D000818:Animals; D002645:Chickens / Q000097:blood / Q000502:physiology*; D002940:Circadian Rhythm; D004530:Egg Yolk; D005260:Female; D014975:Lutein / Q000097:blood*; D010858:Pigmentation
chemical_list: D014975:Lutein