RESUMO
Thirty-six Merino Branco lambs were assigned to six dietary treatments: control diet (C) consisting of 90% dehydrated lucerne and 10% wheat bran; C with 6% of oil blend (CO); C with 2.5% of grape seed extract (GS); GS with 6% of oil blend (GSO); C with 25% of Cistus ladanifer (CL), and CL with 6% of oil blend (CLO). Meat lipid and colour stability was then evaluated during 7 days of storage. The effect of inclusion of grape seed extract and C. ladanifer in diets on meat sensory properties was also evaluated. Meat antioxidant potential, determined after oxidation induction by a ferrous/hydrogen peroxide system, decreased with oil supplementation (P<0.001), but inclusion of grape seed extract and C. ladanifer in diets protected the meat against lipid oxidation (P=0.036). Meat colour was not affected by diets. Inclusion of grape seed extract and C. ladanifer in diets did not change the sensory properties of meat.
Assuntos
Antioxidantes/metabolismo , Dieta/veterinária , Ácidos Graxos Insaturados/metabolismo , Qualidade dos Alimentos , Carne/análise , Músculo Esquelético/metabolismo , Carneiro Doméstico/metabolismo , Tecido Adiposo Branco/química , Tecido Adiposo Branco/crescimento & desenvolvimento , Tecido Adiposo Branco/metabolismo , Animais , Animais Endogâmicos , Antioxidantes/administração & dosagem , Antioxidantes/análise , Cistus/química , Dieta/efeitos adversos , Ácidos Graxos Insaturados/efeitos adversos , Armazenamento de Alimentos , Extrato de Sementes de Uva/química , Extrato de Sementes de Uva/metabolismo , Humanos , Óleo de Semente do Linho/efeitos adversos , Óleo de Semente do Linho/metabolismo , Peroxidação de Lipídeos , Músculo Esquelético/química , Músculo Esquelético/crescimento & desenvolvimento , Pigmentação , Folhas de Planta/química , Óleos de Plantas/efeitos adversos , Óleos de Plantas/metabolismo , Caules de Planta/química , Portugal , Sensação , Carneiro Doméstico/crescimento & desenvolvimento , Óleo de GirassolRESUMO
Thirty-six lambs were used in a 6 week experiment to evaluate the effect of vegetable oil blend supplementation (0 vs 60 g/kg of dry matter (DM)) and two dietary condensed tannin sources, grape seed extract (0 vs 25 g/kg of DM) and Cistus ladanifer L. (0 vs 250 g/kg of DM), on fatty acid (FA) composition of abomasal digesta and intramuscular polar and neutral lipids. Grape seed extract did not affect the FA profile of abomasal digesta or muscle lipid fractions. C. ladanifer had a minor effect in lambs fed diets with no oil but greatly changed the abomasal and muscle FA profiles in oil-supplemented lambs. It decreased 18:0 and increased 18:1 trans-11 in abomasal digesta and increased 18:1 trans-11 and 18:2 cis-9,trans-11 (P = 0.062) in muscle neutral lipids, resulting in an important enrichment of meat 18:2 cis-9,trans-11 when compared to other oil-supplemented diets (19.2 vs 41.7 mg/100 g of muscle).
