title: Effect of retinyl palmitate supplementation on egg yolk retinol and cholesterol concentrations in quail.
abstract: 1. The purpose of this study was to assess the incorporation of retinol into quail egg yolk and cholesterol concentration in response to supplementation with different quantities of retinyl palmitate (600, 1200, 2400 and 4800 microg). 2. Supplementations were performed weekly for 4 weeks and the yolk retinol was measured using high performance liquid chromatography. 3. The results showed a progressive increase in the incorporation of retinol into the egg yolk in response to supplementation, reaching values 384% higher than control values. 4. At the end of supplementation we observed a significant decrease in egg yolk retinol concentrations with supplementations of 2400 and 4800 microg, the most enduring showing high retinol contents even after 3 weeks. 5. Supplementation increased egg weight but neither egg production nor cholesterol levels were significantly altered.
authors.affiliation: Department of Biochemistry, Universidade Federal do Rio Grande do Norte, Centre for Biosciences, Natal, Brazil.
authors.forename: H M M
authors.initials: HM
authors.lastname: Ramalho
authors.forename: K H
authors.initials: KH
authors.lastname: Dias da Silva
authors.forename: V V
authors.initials: VV
authors.lastname: Alves dos Santos
authors.forename: J
authors.initials: J
authors.lastname: dos Santos Cavalcanti
authors.forename: R
authors.initials: R
authors.lastname: Dimenstein
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002784:Cholesterol / Q000032:analysis*; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D004224:Diterpenes; D004305:Dose-Response Relationship, Drug; D004530:Egg Yolk / Q000737:chemistry*; D005260:Female; D011784:Quail / Q000378:metabolism*; D000084562:Retinyl Esters; D014801:Vitamin A / Q000031:analogs & derivatives* / Q000032:analysis* / Q000494:pharmacology
chemical_list: D004224:Diterpenes; D000084562:Retinyl Esters; D014801:Vitamin A; C014794:retinol palmitate; D002784:Cholesterol