1Animal Production, Escuela de Ingenierías Agrarias, Universidad de Extremadura, Ctra de Cáceres s/n, 06071 Badajoz, Spain.
Animal. 2007 Aug;1(7):1060-7. doi: 10.1017/S1751731107000195.
This investigation was designed to evaluate the effects of feeding either free range or in confinement using concentrated diets with the same ingredients and oil source (5.5% of olive oleins) but with different antioxidant supplementation [control diet with a basal level of α-tocopheryl acetate (control); 200 mg/kg synthetic all-rac-α-tocopheryl acetate (Eall-rac); 200 mg/kg natural RRR-α-tocopheryl-acetate (ERRR-); flavonoid extract-enriched diet (AFlav); and phenolic compound-enriched extract (APhen)] on the fatty acid composition and lipid oxidation of Iberian pig muscle longissimus dorsi. The α-tocopherol concentration was significantly higher in muscles from free-range and ERRR- pigs than in muscles from Eall-rac pigs, and γ-tocopherol was only detected in muscles from free-range pigs. Longissimus dorsi muscles from free-range pigs had a significantly lower content of saturated fatty acids and higher content of polyunsaturated fatty acids than muscles from the other five groups of pigs fed in confinement; however, no significant effect on monounsaturated fatty acids was observed. No effect of dietary antioxidant supplementation (synthetic or natural α-tocopherol, flavonoid extract, or phenol extract) on the fatty acid composition of muscles was observed. A significant influence of dietary treatment on lipid oxidation was observed after 3 (P < 0.01), and 7 and 10 (P < 0.001) days of refrigerated storage, respectively. The lowest thiobarbituric acid-reactive substances (TBARS) values were found in pork chops from the free-range and ERRR- groups, intermediate values from the Eall-rac group, followed by AFlav and APhen, while the highest TBARS values corresponded to muscles from pigs fed the control concentrate. The source of α-tocopherol had a significant effect on lipid oxidation (P < 0.05), whereas the AFlav and APhen groups had similar TBARS values.
本研究旨在评估以相同成分和油源（5.5%橄榄油）但具有不同抗氧化剂补充剂[基础水平的α-生育酚乙酸酯（对照）; 200mg/kg 合成全-rac-α-生育酚乙酸酯（Eall-rac）; 200mg/kg 天然 RRR-α-生育酚乙酸酯（ERRR-）; 富含类黄酮提取物的饮食（AFlav）; 和富含酚类化合物的提取物（APhen）]的自由放养或限制饲养对伊比利亚猪肌肉背最长肌脂肪酸组成和脂质氧化的影响。自由放养和 ERRR-猪肌肉中的α-生育酚浓度显著高于 Eall-rac 猪肌肉，而γ-生育酚仅在自由放养猪肌肉中检测到。自由放养猪的背最长肌肌肉的饱和脂肪酸含量明显较低，多不饱和脂肪酸含量较高，而限制饲养的其他五组猪的肌肉则较低; 然而，对单不饱和脂肪酸没有明显影响。日粮抗氧化剂补充剂（合成或天然α-生育酚，类黄酮提取物或酚提取物）对肌肉脂肪酸组成没有影响。在冷藏储存 3（P <0.01），7 和 10 天后（P <0.001），分别观察到日粮处理对脂质氧化的显著影响。在自由放养和 ERRR-组的猪排中发现最低的硫代巴比妥酸反应物质（TBARS）值，Eall-rac 组的中间值，其次是 AFlav 和 APhen，而对照浓缩物喂养的猪的肌肉的 TBARS 值最高。α-生育酚的来源对脂质氧化有显著影响（P <0.05），而 AFlav 和 APhen 组的 TBARS 值相似。
