title: Influence of the dietary polyunsaturation level on chicken meat quality: lipid oxidation.
abstract: The present study was carried out to evaluate the influence of increasing amounts of dietary polyunsaturated fatty acids (PUFA) and alpha-tocopheryl acetate (alpha-TA) supplementation on lipid oxidation of raw and cooked thigh meat stored under refrigeration. One hundred ninety-two female, 1-d-old, broiler chickens were randomly distributed into 16 experimental treatments resuIting from the combination of 4 levels of dietary PUFA (15, 34, 45, and 61 g/kg) and 4 levels of supplementation with alpha-TA (0, 100, 200, and 400 mg/kg). Thiobarbituric acid reactive substance (TBARS) values in cooked meat and cooked refrigerated meat were 12- and 24-fold higher, respectively, than in raw meat. Dietary polyunsaturation and alpha-TA supplementation affected lipid oxidation more markedly in cooked meat and cooked refrigerated meat than in raw meat and raw refrigerated meat. Lipid oxidation in cooked meat showed a significant linear increase as the concentration of PUFA in raw meat increased. The oxidative stability of meat was not affected by an increase in the dietary alpha-TA level from 200 to 400 mg/kg. Nonlinear relationship between TBARS values in cooked meat and alpha-tocopherol content of raw meat showed saturation in the antioxidant effect of alpha-Toc. The equation y = x (11.88 + 63.38e(-0.007z) was calculated to predict the minimum inclusion of alpha-tocopherol to diets (z) of chickens with certain dietary PUFA content (x) to assure a certain TBARS value (y).
authors.affiliation: Department of Animal and Food Science, Facultat de Veterinària, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Cortinas
authors.forename: A
authors.initials: A
authors.lastname: Barroeta
authors.forename: C
authors.initials: C
authors.lastname: Villaverde
authors.forename: J
authors.initials: J
authors.lastname: Galobart
authors.forename: F
authors.initials: F
authors.lastname: Guardiola
authors.forename: M D
authors.initials: MD
authors.lastname: Baucells
mesh_terms: D000818:Animals; D002645:Chickens; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage*; D019587:Dietary Supplements; D005231:Fatty Acids, Unsaturated / Q000032:analysis; D005260:Female; D015227:Lipid Peroxidation; D008460:Meat / Q000032:analysis*; D011786:Quality Control; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis; D024505:Tocopherols; D024502:alpha-Tocopherol / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000032:analysis
chemical_list: D004042:Dietary Fats, Unsaturated; D005231:Fatty Acids, Unsaturated; D017392:Thiobarbituric Acid Reactive Substances; D024502:alpha-Tocopherol; D024505:Tocopherols