Luo Yulong, Wang Bohui, Liu Chang, Su Rina, Hou Yanru, Yao Duo, Zhao Lihua, Su Lin, Jin Ye
College of Food Science and Engineering Inner Mongolia Agricultural University Hohhot China.
Food Sci Nutr. 2019 Aug 2;7(9):2796-2805. doi: 10.1002/fsn3.1039. eCollection 2019 Sep.
The aim of the present work was to investigate the effects of feeding regimens (pasture vs. mixed diet) on meat quality, fatty acids, volatile compounds, and antioxidant properties in lamb meat. In total, 24 lambs were allotted into two feeding regimens at 10.23 kg live weight. Lambs were fed on pasture grass (PG group, = 12) or mixed diet (M group, = 12). (LT) muscle samples from the M group had a higher intramuscular fat (IMF) ( < 0.05), pHvalue ( < 0.01), and ash ( < 0.05) than the PG group. In contrast, the shear force ( < 0.05), L*( < 0.05), and b* ( < 0.001) in M group were lower than in PG group. Analyses indicated that PG group contained higher linolenic acid (C18:3n3) and docosatrienoic acid (C22:3n6) ( < 0.05) than the M group. Major volatile compounds in the muscles included hexanal, heptanal, nonanal, octanal, 1-pentanol, 1-hexanol, 1-octen-3-ol, and 2,3-octanedione. The levels of hexanal, nonanal, and 2,3-octanedione were significantly lower in PG lamb muscle ( < 0.01). In contrast, 1-pentanol and 1-hexanol levels were higher in M lamb muscle ( < 0.01). Muscle from PG lamb exhibited higher catalase (CAT) and glutathione peroxidase (GPx) activity ( < 0.05). PG muscle also contained a higher radical-scavenging ability (RSA; < 0.001) and cupric-reducing antioxidant capacity (CUPRAC; < 0.05). Overall, the improved antioxidant status in PG muscle inhibited lipid peroxidation (aldehydes and ketones), thereby improving the meat quality.
本研究的目的是调查饲养方式（放牧与混合日粮）对羊肉肉质、脂肪酸、挥发性化合物和抗氧化特性的影响。总共24只羔羊在体重10.23千克时被分配到两种饲养方式中。羔羊分别饲喂牧草（PG组，n = 12）或混合日粮（M组，n = 12）。M组的（LT）肌肉样本的肌内脂肪（IMF）含量（P < 0.05）、pH值（P < 0.01）和灰分（P < 0.05）均高于PG组。相比之下，M组的剪切力（P < 0.05）、L值（P < 0.05）和b值（P < 0.001）低于PG组。分析表明，PG组的亚麻酸（C18:3n3）和二十二碳三烯酸（C22:3n6）含量（P < 0.05）高于M组。肌肉中的主要挥发性化合物包括己醛、庚醛、壬醛、辛醛、1-戊醇、1-己醇、1-辛烯-3-醇和2,3-辛二酮。PG组羔羊肌肉中的己醛、壬醛和2,3-辛二酮含量显著较低（P < 0.01）。相比之下，M组羔羊肌肉中的1-戊醇和1-己醇含量较高（P < 0.01）。PG组羔羊的肌肉表现出较高的过氧化氢酶（CAT）和谷胱甘肽过氧化物酶（GPx）活性（P < 0.05）。PG组肌肉还具有较高的自由基清除能力（RSA；P < 0.001）和铜离子还原抗氧化能力（CUPRAC；P < 0.05）。总体而言，PG组肌肉中改善的抗氧化状态抑制了脂质过氧化（醛类和酮类），从而改善了肉质。
