The chemical composition and volatile profile of the Longissimus thoracis et lumborum muscle of lambs reared in two distinct production systems (intensive and extensive) was evaluated. For this, sixty-six lambs for meat production of the autochthonous Gallega Iberian breed were raised with concentrate and grass in intensive (30 animals) and extensive (36 animals) system, respectively, until 4–4.5 months of age when they were slaughtered. Subsequently, Longissimus thoracis et lumborum muscles were excised for the determination of chemical composition (moisture, intramuscular fat, protein, and ash percentages) and volatile substances. The aftermaths obtained evidenced that moisture (75.90% and 75.68%), intramuscular fat (1.68% and 1.76%), and protein (20.62% and 20.97%) contents were not significantly (P > 0.05) affected by the production system. However, the extensively-fed lambs displayed a higher ash content (1.35% vs. 1.24%). Additionally, the total volatile content was also not significantly (P > 0.05) influenced by feeding system. Despite this, the total content of hydrocarbons, acids, aldehydes, ketones, esters, ethers, furans, sulfur compounds, and others was significantly (P < 0.05) affected by diet, being the alcohol family the only group not influenced (P > 0.05) by the production system (1321.3 vs. 1211.3 AU × 10⁴/g fresh muscle). Specifically, intensively-fed lambs showed significantly higher amounts for all volatile families apart from ketones (2215 vs. 2826 AU × 10⁴/g fresh muscle) and sulfur compounds (22.7 vs. 123.7 AU × 10⁴/g fresh muscle). In addition, benzyl alcohol and carbon disulfide were proposed as appropriate biomarkers for grass diets, while 1-butanone, 2-heptanone, and furan, 2-penthyl were indicated as suitable tracers for concentrate-based diets.

评价了在两种不同的生产系统（集约化和集约化）下饲养的羔羊的Longissimus thoracis et lumborum肌肉的化学组成和挥发性分布。为此，分别在集约化（30只动物）和集约化（36只动物）系统中，分别在精制和粗养系统中饲养了66只羔羊，用于浓缩肉和草，直到将其屠宰4–4.5个月大为止。随后，龙眼和腰切除肌肉以测定化学成分（水分，肌内脂肪，蛋白质和灰分百分比）和挥发性物质。获得的结果表明，水分 对生产系统的影响不明显（P > 0.05），水分（75.90％和75.68％），肌内脂肪（1.68％和1.76％）以及蛋白质（20.62％和20.97％）含量没有显着影响（P > 0.05）。但是，粗饲羔羊的灰分较高（1.35％比1.24％）。此外， 进料系统对总挥发物含量的影响也不显着（P > 0.05）。尽管如此，碳氢化合物，酸，醛，酮，酯，醚，呋喃，硫化合物等的总含量还是很大（P <0.05）受饮食影响，是唯一不受 生产系统影响的酒精族（P > 0.05）（1321.3对1211.3 AU×10 ⁴ / g新鲜肌肉）。具体来说，除了酮（2215对2826 AU×10 ⁴ / g新鲜肌肉）和硫化合物（22.7对123.7 AU×10 ⁴ / g新鲜肌肉）外，所有绵羊的所有挥发性家族的精饲羔羊的数量均显着增加。此外，建议将苯甲醇和二硫化碳作为草料日粮的适当生物标志物，而1-丁酮，2-庚酮和呋喃，2-苄基则被指示为适用于浓缩日粮的示踪剂。