The objective of the present research was to characterize the chemical composition and volatile compounds of longissimus thoracis et lumborum muscle from lambs of different origin: an autochthonous Spanish breed (namely Castellana) and a commercial breed (namely INRA 401). For this, 15 Castellana and 14 INRA 401 lambs raised on concentrate plus cereal straw from two farms were slaughtered at 4 months of age. The longissimus thoracis et lumborum muscle of all carcasses was removed and chemical composition (moisture, protein, fat, and ash contents) and volatile profile was analyzed. The outcomes showed that chemical composition was not significantly (P > 0.05) different between both groups of animals. On the contrary, the total content of volatile compounds was significantly (P < 0.001) different, with the Castellana lambs displaying the highest amounts. Similarly, the total content of most of the families of volatile compounds (namely total hydrocarbons, acids, alcohols, aldehydes, ketones, esters, ethers, and “other compounds”) and the level of most individual compounds were significantly (P < 0.001) higher in the Castellana breed, except for the family of sulfur compounds, which was not significantly (P> 0.05) affected. These differences may lead to differences in the aromatic perception of lambs, which may be important for consumer acceptance.

本研究的目的是鉴定来自不同来源的羔羊：西班牙本地种（Castellana）和商业品种（INRA 401）的长肌和腰肌的化学成分和挥发性化合物。为此，在4个月大时将15个Castellana和14个INRA 401羔羊用两个农场的精矿和谷物秸秆饲养而成。所述最长胸外科等lumborum所有胴体肌肉除去和化学成分（水分，蛋白质，脂肪，和灰分含量）和挥发性轮廓进行了分析。结果表明化学成分不明显（P> 0.05）两组动物之间的差异。相反，挥发性化合物的总含量存在显着差异（P <0.001），其中Castellana羔羊显示出最高含量。同样，大多数挥发性化合物家族的总含量（即总烃，酸，醇，醛，酮，酯，醚和“其他化合物”的总含量）和大多数单个化合物的含量也显着（P <0.001）卡斯泰拉纳品种中的硫含量较高，除了含硫化合物家族不受显着影响（P > 0.05）。这些差异可能导致羔羊的芳香感差异，这对于消费者的接受度可能很重要。