title: Effect of flaxseed oil in diet on fatty acid composition in the liver of Nile tilapia (Oreochromis niloticus).
abstract: This study analyzed the effects of different concentrations of flaxseed oil (FO) on the proximate composition and the contents of alpha-linolenic acid (LNA, 18:3n-3), eicosapentaenoic (EPA, 20:5n-3), and docosahexaenoic (DHA, 22:6n-3) fatty acids in the liver of cultured Nile tilapia (Oreochromis niloticus). During the five-month culture period, tilapias were given diets with incremental concentrations of FO (0.00%; 1.25%; 2.50%; 3.75%, and 5.00%) as a replacement of sunflower oil (control). There was no significant difference in moisture and ash content in the liver between treatments. Protein values ranged from 12.1% (treatment II) to 13.9% (treatment V) and total lipids ranged from 5.6% (treatment V) to 7.2% (treatment II). There was no significant difference between most treatments. Fatty acid methyl esters (FAMEs) were quantitatively analyzed by capillary gas chromatography against a C(23:0), internal standard. Variations in concentrations (in mg g(-1) of total lipids) of fatty acids between treatment I and treatment V ranged from 4.2 to 51.2 (LNA), from 0.2 to 2.3 (EPA), and from 10.6 to 56.2 (DHA), respectively. This experiment demonstrated that increasing amounts of LNA in feed may markedly increase the amounts of LNA, EPA, and DHA in the liver of Nile tilapia.
authors.affiliation: Universidade Estadual de Maringá, Maringá, Brazil.
authors.forename: Ana Carolina
authors.initials: AC
authors.lastname: Aguiar
authors.forename: Damila Rodrigues
authors.initials: DR
authors.lastname: Morais
authors.forename: Leandra Pereira
authors.initials: LP
authors.lastname: Santos
authors.forename: Flavia Braidotti
authors.initials: FB
authors.lastname: Stevanato
authors.forename: Jeane Eliete Laguila
authors.initials: JE
authors.lastname: Visentainer
authors.forename: Nilson Evelázio
authors.initials: NE
authors.lastname: de Souza
authors.forename: Jesuí Vergilio
authors.initials: JV
authors.lastname: Visentainer
mesh_terms: D000821:Animal Feed; D000818:Animals; D002849:Chromatography, Gas; D023681:Cichlids; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage / Q000378:metabolism*; D005227:Fatty Acids / Q000032:analysis*; D008043:Linseed Oil / Q000008:administration & dosage*; D008099:Liver / Q000737:chemistry*
chemical_list: D004042:Dietary Fats, Unsaturated; D005227:Fatty Acids; D008043:Linseed Oil