藏绵羊及白-藏羊肌纤维特性研究

以12月龄的藏绵羊和白萨福克羊-藏羊为研究对象,采用石蜡切片的方法,测定了其背最长肌、臂三头肌和股二头肌的肌纤维直径、肌纤维面积和肌纤维密度。结果表明,白-藏羊和藏绵羊的公羊、母羊的背最长肌、臂三头肌和股二头肌3个部位间的肌纤维直径、肌纤维面积和肌纤维密度等特性均差异不显著;藏绵羊公羊、母羊和白-藏羊公羊、母羊的背最长肌的肌纤维直径、肌纤维面积和肌纤维密度均差异不显著。白-藏羊公羊的臂三头肌肌纤维直径极显著高于藏绵羊母羊,白-藏羊母羊显著高于藏绵羊母羊,白-藏羊公羊、母羊肌纤维面积均极显著高于藏绵羊母羊,藏绵羊母羊肌纤维密度显著高于白-藏羊公羊、母羊,藏绵羊公羊显著高于白-藏羊母羊;白-藏羊公羊股二头肌的肌纤维直径显著高于藏绵羊母羊,白-藏羊公羊、母羊的肌纤维面积显著高于藏绵羊母羊,藏绵羊母羊的肌纤维密度显著高于白-藏羊母羊。

Muscle Fibre Characteristics of Tibetan and White-Tibetan Sheep

Using the methods of paraffin section, we tested the muscle fiber diameter, muscle fiber cross-sectional area, and muscle fiber density of twelve-months-old Tibetan sheep and White Suffolk sheep. The results showed that muscle fiber di-ameter, muscle fiber cross-sectional area, and muscle fiber density had no significant difference among longissimus dorsi muscle, triceps muscle of arm, and biceps femoris muscle of rams and ewes of Tibetan sheep and White-Tibetan sheep. Those of longissimus dorsi muscle, triceps muscle of arm, and biceps femoris muscle had no significant difference between rams and ewes of Tibetan sheep and White-Tibetan sheep. Muscle fiber diameter of triceps muscle of arm of rams of White-Tibetan sheep was significantly higher than those of ewes of Tibetan sheep; and that those of ewes of White-Tibetan sheep was higher than those of ewes of Tibetan sheep; muscle fiber cross-sectional area of triceps muscle of arm of rams and ewes of White-Tibetan sheep were higher than those of ewes of Tibetan sheep; muscle fiber density of triceps muscle of arm of ewes of Tibetan sheep were higher than those of rams and ewes of White-Tibetan sheep; and those of rams of Tibetan sheep was higher than those of ewes of White-Tibetan sheep; muscle fiber diameter of biceps femoris muscle of rams of White-Ti-betan sheep was higher than those of ewes of Tibetan sheep; muscle fiber cross- sectional area of rams and ewes of White-Tibetan sheep were higher than those of ewes of Tibetan sheep; muscle fiber density of ewes of Tibetan sheep was higher than those of ewes of White-Tibetan sheep.