地区因素对内蒙古羊肉营养品质及同位素丰度δ13C, δ15N影响的研究 The Effects of Regions on Nutrient Quality and δ13C, δ15N Value of the Mutton in Inner Mongolia

选择内蒙古东部和西部肉羊55只，对其进行营养品质及同位素丰度δ13C，δ15N的测定。结果显示，东部羊肉的水分含量显著高于西部(p < 0.05)，而西部羊肉脂肪含量显著高于东部(p < 0.05)。东部地区羊肉中的δ15N值显著高于内蒙古西部(p < 0.05)。东部羊肉的天冬氨酸和谷氨酸的含量显著高于西部(p < 0.05)。试验表明，内蒙古东部羊肉具有高水分含量、低脂肪含量的特点，与西部羊肉相比，具有更强的肉鲜风味。因此，根据羊肉中C和N同位素丰度，可以对羊肉的产地进行有效溯源，且饲料中C3和C4植物的混合比例不同，会影响肉中稳定性C的丰度值；同时，利用δ15N值能够区分牧区和农区的羊肉样品。 The 55 mutton sheep have been chosen from the east and west area of Inner Mongolia, and the nutritional quality and isotope abundance of δ13C, δ15N were analyzed. The result showed that the moisture content from eastern muttons was significantly higher than that of western (p < 0.05). However, the fat content from western muttons was higher than that of eastern (p < 0.05). The δ15N value from eastern muttons was higher than that of western (p < 0.05). Meanwhile the content of aspartic acid and glutamic acid of eastern muttons was higher than that of western (p < 0.05). The present study indicated that the eastern mutton had characteristics of high moisture and low fat, and the flavor was stronger than the western one. In addition, the producing origin of mutton could be effectively traced via isotope abundance of C and N, and the different ratio of C3 and C4 plants in feed could influence the content of stable C in mutton. The value of δ15N could also be applied for distinguishing muttons came from pastoral area and agricultural area.