title: Effect of dietary fats on hepatic lipid metabolism in the growing turkey.
abstract: The influence of dietary fatty acids on hepatic capacity of lipid synthesis and secretion was investigated in 7-week-old male turkeys. They were fed 10% of either lard (rich in saturated and monounsaturated fatty acids) or linseed oil (rich in polyunsaturated fatty acids, especially 18:3n-3). Fattening was identical with both diets (0.15-0.20% of abdominal adipose tissue), but the proportion of muscle Pectoralis major was lower with linseed oil (6.6 vs. 7.4%). Specific activities of lipogenic enzymes (ME, G6PDH, ACX, and Delta9-desaturase) were not influenced by the diet, however, FAS activity was lower with linseed oil (14.3 vs. 25.4 nM NADPH fixed/min). Fasting concentrations of lipoproteins synthesized and secreted by the liver, VLDL and HDL, were also lower with linseed oil, as well as plasma concentrations of phospholipids and cholesteryl esters. However, when VLDL catabolism was inhibited by injection of an antiserum against LPL, VLDL concentration was identical in both groups (100-120 mg/l), whereas that of phospholipids and cholesteryl esters, that are transported by HDL mainly, remained lower with linseed oil. Thus, in the growing turkeys, and contrary to mammals and the chicken, feeding n-3 polyunsaturated fatty acids did not decrease hepatic triglyceride synthesis and secretion, nor fattening. By contrast, in this species, n-3 polyunsaturated fatty acids appear to influence mostly HDL metabolism, with a negative impact on muscular growth.
authors.affiliation: INRA, Station de Recherches Avicoles, 37380 Nouzilly, France.
authors.forename: Amal
authors.initials: A
authors.lastname: Mossab
authors.forename: Michel
authors.initials: M
authors.lastname: Lessire
authors.forename: Solange
authors.initials: S
authors.lastname: Guillaumin
authors.forename: Maryline
authors.initials: M
authors.lastname: Kouba
authors.forename: Jacques
authors.initials: J
authors.lastname: Mourot
authors.forename: Philippe
authors.initials: P
authors.lastname: Peiniau
authors.forename: Dominique
authors.initials: D
authors.lastname: Hermier
mesh_terms: D000818:Animals; D001823:Body Composition / Q000187:drug effects; D004032:Diet; D004041:Dietary Fats / Q000494:pharmacology*; D005215:Fasting; D008043:Linseed Oil / Q000494:pharmacology; D050356:Lipid Metabolism; D008055:Lipids / Q000096:biosynthesis / Q000097:blood; D008074:Lipoproteins / Q000097:blood / Q000737:chemistry / Q000378:metabolism; D008099:Liver / Q000187:drug effects* / Q000378:metabolism*; D008297:Male; D014422:Turkeys / Q000254:growth & development* / Q000378:metabolism*
chemical_list: D004041:Dietary Fats; D008055:Lipids; D008074:Lipoproteins; D008043:Linseed Oil; C029310:lard