Influence of different dietary doses of n-3- or n-6-rich vegetable fats and alpha-tocopheryl acetate supplementation on raw and cooked rabbit meat composition and oxidative stability.
This study evaluates the effects of replacing beef tallow added to rabbit feeds (3% w/w) by different doses (0%, 1.5% and 3% w/w) of n-6- or n-3-rich vegetable fat sources (sunflower and linseed oil, respectively) and alpha-tocopheryl acetate supplementation (0 and 100 mg/kg) on the fatty acid composition, alpha-tocopherol content, and oxidation levels [assessed by analyzing thiobarbituric acid (TBA) and lipid hydroperoxide values] in rabbit meat. We also measured these parameters after cooking and refrigerated storage of cooked rabbit meat. Both dietary alpha-tocopheryl acetate supplementation and the dose and source of fat added to feeds influenced meat fatty acid composition, modifying the n-6/n-3 ratio, which was more nutritionally favorable when linseed oil was used. Furthermore, the addition of linseed oil and the supplementation with alpha-tocopheryl acetate enhanced long-chain PUFA biosynthesis. However, the addition of 3% linseed oil increased meat oxidation, and although it was reduced by dietary supplementation with alpha-tocopheryl acetate in raw meat, this reduction was not as effective after cooking. Therefore, dietary supplementation with 1.5% linseed oil plus 1.5% beef tallow and with alpha-tocopheryl acetate would be recommended to improve the nutritional quality of rabbit meat.
Tres
Alba
A
Nutrition and Food Science Department-XaRTA-INSA, Faculty of Pharmacy, University of Barcelona, Avinguda Joan XXIII s/n, 08028 Barcelona, Spain.
Bou
Ricard
R
Codony
Rafael
R
Guardiola
Francesc
F
D000821:Animal Feed / Q000032:analysis; D000818:Animals; D004041:Dietary Fats / Q000008:administration & dosage*; D005227:Fatty Acids / Q000032:analysis; D015525:Fatty Acids, Omega-3 / Q000008:administration & dosage*; D043371:Fatty Acids, Omega-6 / Q000008:administration & dosage*; D006358:Hot Temperature; D008043:Linseed Oil / Q000008:administration & dosage; D008460:Meat / Q000032:analysis*; D010084:Oxidation-Reduction; D010938:Plant Oils / Q000008:administration & dosage; D011817:Rabbits; D000074242:Sunflower Oil; D024505:Tocopherols; D024502:alpha-Tocopherol / Q000008:administration & dosage / Q000031:analogs & derivatives*
D004041:Dietary Fats; D005227:Fatty Acids; D015525:Fatty Acids, Omega-3; D043371:Fatty Acids, Omega-6; D010938:Plant Oils; D000074242:Sunflower Oil; D008043:Linseed Oil; D024502:alpha-Tocopherol; D024505:Tocopherols