title: [Incorporation and mobilization of vitamin A in laying hens].
abstract: 216 laying hybrids were given diets with 1500, 3000 or 6000 IU vitamin A kg-1 between their 21st and 64th week of age. The ration did not contain any vitamin A between the 5th and 16th as well as the 25th and 28th week. The control animals were fed a diet with 6000 IU kg-1. Feed consumption, laying performance, egg weight, feed efficiency, mortality and the vitamin A content in egg yolk and liver depend on the vitamin A supply. 4-week depletion took an adverse effect on feed intake and laying performance. It was not possible to detect vitamin A in the egg yolk after 4 weeks and in the liver after 16 weeks of depletion.
authors.affiliation: Thüringer Landesanstalt für Landwirtschaft, Jena, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Richter
mesh_terms: D000375:Aging / Q000502:physiology; D000821:Animal Feed; D000818:Animals; D002645:Chickens / Q000502:physiology*; D004530:Egg Yolk / Q000737:chemistry; D002149:Energy Intake; D005260:Female; D005527:Food, Fortified; D008099:Liver / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism; D009929:Organ Size; D010058:Oviposition; D014801:Vitamin A / Q000378:metabolism* / Q000493:pharmacokinetics
chemical_list: D014801:Vitamin A