寒泊羊和小尾寒羊的肌肉组织学性状及理化性状比较研究

Comparative Study on the Histological Traits and Physicochemical Properties of Muscles in Small-tail Han Sheep and Crossbred Hanper Sheep

本研究以育肥的小尾寒羊和寒泊羊的羔羊为试验动物,采集背最长肌、臂三头肌、股二头肌和臀中肌样品,测定了肌纤维横截面积、直径、粗脂肪含量和氨基酸种类及含量。结果表明,寒泊羊背最长肌肌纤维直径和横截面积均小于小尾寒羊(P<0.01),股二头肌肌纤维直径和横截面积大于小尾寒羊(P<0.05)。寒泊羊背最长肌和股二头肌粗脂肪含量高于小尾寒羊(P<0.01,P<0.05),臂三头肌和臀中肌粗脂肪含量略高于小尾寒羊(P>0.05)。小尾寒羊肉中牛磺酸含量高于寒泊羊(P<0.01),其余17种氨基酸含量两品种羊肉间差异不显著(P>0.05)。与肉鲜味有关的5种氨基酸,寒泊羊肌肉的含量高于小尾寒羊。除赖氨酸和色氨酸外,其余6种人体必需氨基酸寒泊羊肌肉的含量高于小尾寒羊。

Well-fed Small-tail Han sheep and crossbred Hanper sheep were selected respectively, and the longissimus dorsi, gluteus medius, biceps femoris, triceps brachii muscle samples were collected. We detected the myofiber cross-sectional areas, diameters, crude fat content and the amino acids composition in muscles. The results showed that the diameter and cross-sec- tional area of longissimus dorsi in Hanper sheep were significant less than that in Small-tail Han sheep （P〈0.01）. The diame- ter and cross-sectional area of biceps femoris in Hanper sheep were greater than that in Small-tail Han sheep （P（0.05）. Crude fat contents of longissimus dorsi and biceps femoris in Hanper sheep were higher than that in Small-tail Han sheep （P〈0.01, P〈0.05）. There was no difference in crude fat contents of triceps brachii and gluteus medius between the 2 species （P〉0.05）. Taurine content in Small-tail Han sheep was greater than that in Hanper sheep （P〈0.01）. The other 17 kinds of ami- no acids between the 2 species were not difference （P〉0.05）. Five kinds of flavor amino acids contents in Hanper sheep were greater than that in Small-tail Han sheep. The six kinds of essential amino acids contents except lysine and tryptophan in Han- per sheep were higher than that in Small-tail Han sheep.