草原戈壁短尾羊肉营养成分分析

为探究内蒙古包头市草原戈壁短尾羊肉的营养品质，选取12 只6 月龄草原戈壁短尾羊，宰后分别取股二头肌、肱三头肌和背最长肌，进行理化指标、脂肪酸、氨基酸、矿物质元素等营养成分测定。结果表明：草原戈壁短尾羊肉pH24 h为5.66左右，水分含量达70.47%，粗脂肪含量为7.37%，粗蛋白含量达21.43%，矿物质含量为3.00%；骨骼肌脂肪酸中含量较高的脂肪酸有C6:0、C10:0、C16:1、C22:0；在测定的氨基酸中，谷氨酸含量最高，其次为天冬氨酸、亮氨酸、赖氨酸、精氨酸等，必需氨基酸中背最长肌苏氨酸含量显著高于股二头肌（P＜0.05），肱三头肌中的含量介于二者之间，其他必需氨基酸含量在3 个部位中差异不显著；共检测了钾、钙、钠、镁、铜、锌、铁、锰8 种矿物质元素，其中除钾元素以外，其他元素在3 个部位中含量均有显著性差异（P＜0.05）。

Analysis of Nutritional Components of the Meat of Gobi Short-Tailed Sheep

In order to explore the nutritional quality of the meat of Gobi short-tailed sheep in Baotou,Inner Mongolia,12 six-month-old lambs were selected in this experiment.After slaughter,Biceps femoris,Triceps brachii and Longissimus dorsi muscles were taken to determine physicochemical properties,fatty acids,amino acids,mineral elements,and other nutrients.The results showed that the pH_(24 h) of the muscles was about 5.66,the moisture content was 70.47%,the crude fat content was 7.37%,the crude protein content was 21.43%,and the mineral content was 3.00%.The dominant fatty acids in the skeletal muscles were C_6:0,C_10:0,C_16:1 and C_22:0.Among the determined amino acids,glutamic acid was the most abundent,followed by aspartic acid,leucine,lysine,arginine and so on.The content of threonine as an essential amino acid for humans in Longissimus dorsi was significantly higher than that in Biceps femoris(P<0.05),and that in Triceps brachii was in the middle.No significant difference was found among the three msucles in other essential amino acids.The contents of calcium,sodium,magnesium,copper,zinc,iron,and manganese but not potassium were significantly different among the three skeletal muscles(P<0.05).