The objective of this study was to evaluate the effects of three finishing systems based on concentrate and legume-grass pasture on beef. Steers were finished for 91 days with an exclusively whole corn grain-based (GRAIN) diet, grazed on legume-grass pasture plus 1.4% of body weight of whole corn grain supplementation (SUPP), or grazed on legume-grass pasture (PAST) only. Lipid and myoglobin oxidation, pH, objective color, and α-tocopherol concentrations were evaluated on M. longissimus thoracis steaks. Dietary treatments did not affect pH and minimally affected protein carbonylation. Steaks from steers fed GRAIN were less red, showed higher lipid oxidation during retail display, and higher metmyoglobin formation from day 7 to 13 when compared to PAST. Levels of α-tocopherol were higher in steaks from steers fed diets containing legume and grass. Inclusion of roughage in finishing diets is essential to maintain retail color and prevent lipid and myoglobin oxidation.

这项研究的目的是评估基于精饲料和豆科牧草的三种整理系统对牛肉的影响。使用完全基于玉米谷物的饮食（全谷物），在豆类草牧场上放牧加上全谷物谷物补充剂（SUPP）重量的1.4％或在豆类草牧场上吃草（PAST）来完成Ste牛91天只要。评估了M. longissimus thoracis上脂质和肌红蛋白的氧化，pH，目标颜色和α-生育酚浓度牛排。饮食治疗不会影响pH值，并且对蛋白质羰基化的影响很小。与PAST相比，从GRAIN饲喂的ers牛的牛排鲜红色少，在零售展示期间显示出更高的脂质氧化，并且在第7天到第13天时形成了更高的肌红蛋白。饲喂含豆类和草的日粮的牛排中的α-生育酚水平较高。粗饲料中要包括粗饲料，对于保持零售颜色并防止脂质和肌红蛋白氧化至关重要。