Effect of free-range rearing and α-tocopherol and copper supplementation on fatty acid profiles and susceptibility to lipid oxidation of fresh meat from Iberian pigs

Effects of dietary incorporation of different antioxidant extracts and free-range rearing on fatty acid composition and lipid oxidation of Iberian pig meat

“…C18:2 n-6, C18:3 n-3 and C20:2 n-6, than pigs receiving experimental concentrate feeds. These results are in agreement with those reported previously in Iberian pigs fed on free-range and concentrated diets (Cava et al, 2000;Tejeda et al, 2002;Daza et al, 2005). No significant influence of free-range feeding or experimental diets in confinement on monounsaturated fatty acids, i.e.…”

“…These results are in accordance with those reported in the literature for Iberian (Cava et al, 2000;Daza et al, 2005) and lean (Monahan et al, 1992;Ló pez-Bote et al, 1997;Rey et al, 2004) pigs in which a-tocopherol-enriched diets did not modify the fatty acid profiles of fat deposits. However, other authors found an effect of a-tocopheryl acetate supplementation on n-9 fatty acids in pigs ) and chickens (Fuhrmann and Sallman, 1996), results ascribed to a possible effect of the a-tocopherol on the D-9 desaturase activity (Okayasu et al, 1977).…”

“…Generally, it reflected the tocopherol concentration of the diets, being significantly higher (P , 0.001) in the longissimus dorsi muscle of pigs fed on the natural tocopherol-enriched diet (E RRR-) and free-range system than those fed on non-a-tocopherol-enriched diets (control, A Flav and A Phen ); the 200 mg/kg diet synthetic a-tocopheryl acetate-enriched diet (E all-rac ) gave intermediate values (2.05 mg/g). These findings may be due to a higher consumption of vitamin E in E RRR-and free-range pigs than the non-a-tocopherol-enriched diets, in agreement with results previously reported in Iberian pigs (Rey et al, 1998;Cava et al, 2000;Gonzá lez et al, 2006). However, in the E all-rac group the a-tocopherol content was significantly lower than in the E RRR-and free-range groups, although the a-tocopherol content of their diets was similar.…”

“…The nutritive value of the concentrates is in accordance with the standards used in Iberian pigs. The fatty acid composition of the diets are in agreement with values previously reported in studies involving the feeding of Iberian pigs (Cava et al, 2000;Gonzá lez et al, 2006;Ventanas et al, 2006) with a higher level of monounsaturated and a lower level of polyunsaturated fatty acids in acorns than in the diet concentrate and grass. Even compared with the oleic acid-enriched diet concentrate, acorns had a higher content of C18:1 n-9 than the concentrate (59.55 v. 54.74 g/100 g fatty acids).…”

“…These results are evidence that diets rich in vitamin E decrease the susceptibility to lipid oxidation in pig longissimus dorsi muscle. The positive effect of vitamin E on lipid oxidation in the presence of dietary oils has been previously reported in Iberian pigs (Cava et al, 2000) and in pigs of improved genotypes (Monahan et al, 1992;Ló pez-Bote et al, 2003). Conversely, other authors have reported that supranutritional vitamin E did not decrease TBARS values (Cherian et al, 1996;Daza et al, 2005).…”