title: Effect of vitamin E supplementation and diet on fatty acid composition and on meat colour and lipid oxidation of lamb leg steaks displayed in modified atmosphere packs.
abstract: Groups of 8 lambs were allocated to one of five concentrate diets supplemented with all-rac-α-tocopheryl acetate containing 30 (C30), 60 (C60), 120 (C120), 250 (C250) and 500 (C500) mg/kg dry matter. Two other groups were fed grass silage and 400 g/day concentrate with 60 (S60) or 500 (S500) mg α-tocopheryl acetate/kg dry matter. Within diet, vitamin E level did not affect growth performance or carcass characteristics. Basal diet did not affect final live weight, conformation and fatness scores. M. semimembranosus from S lambs contained more α-tocopherol than that of C lambs on the same intake and by day 6 in MAP (75%O2/25%CO2) chroma and a* were below acceptable levels in C30 lambs. TBARS were higher in C30 and C60 muscle than in other treatments (P<0.001) after 3 and 6 days display. Muscle fatty acid composition varied with basal diet but lipid oxidation depended more on vitamin E concentration with an initial concentration of 1.9 μg/g muscle preventing significant lipid oxidation.
authors.affiliation: School of Veterinary Science, University of Bristol, Langford, Bristol, UK.
authors.forename: E
authors.initials: E
authors.lastname: Kasapidou
authors.forename: J D
authors.initials: JD
authors.lastname: Wood
authors.forename: R I
authors.initials: RI
authors.lastname: Richardson
authors.forename: L A
authors.initials: LA
authors.lastname: Sinclair
authors.forename: R G
authors.initials: RG
authors.lastname: Wilkinson
authors.forename: M
authors.initials: M
authors.lastname: Enser
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D003116:Color; D019587:Dietary Supplements; D005227:Fatty Acids / Q000032:analysis*; D018857:Food Packaging / Q000379:methods; D050356:Lipid Metabolism; D008460:Meat; D018482:Muscle, Skeletal / Q000737:chemistry; D012756:Sheep; D014810:Vitamin E / Q000008:administration & dosage*
chemical_list: D005227:Fatty Acids; D014810:Vitamin E