Horcada Alberto, Polvillo Oliva, González-Redondo Pedro, López Adoración, Tejerina David, García-Torres Susana
Departamento de Ciencias Agroforestales, Escuela Técnica Superior de Ingeniería Agronómica, Universidad de Sevilla, 41013 Sevilla, Spain.
Servicio General de Investigación Agraria (CITIUS), Universidad de Sevilla, 41013 Sevilla, Spain.
Arch Anim Breed. 2020 Feb 12;63(1):45-52. doi: 10.5194/aab-63-45-2020. eCollection 2020.
In order to study the effect of different amounts of concentrate feed and the effectiveness of natural antioxidants on the fatty acid stability of intramuscular fat during the first days postmortem, 75 young bulls of the Retinta breed were divided in three groups: 30 were grazed, 30 were fed on medium concentrate diets, and 15 were fed on high-concentrate diets. Young bulls were slaughtered at commercial weight, around a 500 kg final body weight. Samples from muscle were assigned to two ageing periods (0 and 7 d) and were vacuum packaged in vacuum bags ( permeability: 9.3 / per 24 at 0 ) using an EGARVAC sealer. Beef from grass-fed bulls showed a higher polyunsaturated fatty acid content than concentrate-fed bulls. During the first 7 d postmortem, no changes in the fatty acids profile were observed, because -tocopherol content was optimal to prevent lipid oxidation. The higher level of natural antioxidants in grass than in grain resulted in the stability of the fatty acid profile. This study shows that the anti-oxidative potential of natural antioxidants in meat plays an important role during the first 7 d postmortem.
为了研究不同精饲料量以及天然抗氧化剂对宰后初期肌肉脂肪中脂肪酸稳定性的影响，将75头雷廷塔品种的小公牛分为三组：30头放牧饲养，30头饲喂中等精饲料日粮，15头饲喂高精饲料日粮。小公牛在达到商业体重时屠宰，最终体重约500千克。取自肌肉的样本被分为两个成熟阶段（0天和7天），并使用EGARVAC封口机真空包装在真空袋中（渗透率：0℃时每24小时9.3 / ）。草饲公牛的牛肉比精饲公牛含有更高的多不饱和脂肪酸含量。在宰后前7天，未观察到脂肪酸谱的变化，因为生育酚含量处于防止脂质氧化的最佳水平。草中天然抗氧化剂的含量高于谷物，这导致了脂肪酸谱的稳定性。本研究表明，肉中天然抗氧化剂的抗氧化潜力在宰后前7天起着重要作用。
