舍饲牦牛、犏牛与放牧牦牛的肌纤维特性研究

Study on the muscle fiber characteristics of house-feeding yaks,yak-cattles and grazing yaks

以小金县4.5岁的牦牛、犏牛的公牛为研究对象,采用舍饲和放牧饲喂,屠宰后采集舍饲牦牛、犏牛和放牧牦牛的背最长肌、臂三头肌和股二头肌等部位的肌肉,测定其肌纤维直径、肌纤维密度、肌内肌纤维含量和肌内结缔组织含量。结果表明,舍饲牦牛、犏牛和放牧牦牛的肌纤维直径、肌内肌纤维含量在3个肌肉部位间无显著差异;舍饲牦牛臂三头肌的肌纤维密度显著高于股二头肌;舍饲犏牛背最长肌和臂三头肌的肌内结缔组织含量显著高于股二头肌;舍饲犏牛、放牧牦牛的肌纤维密度和舍饲牦牛、放牧牦牛的肌内结缔组织含量在3个肌肉部位间无显著差异;3个部位肌肉的肌内肌纤维含量和肌内结缔组织含量在舍饲牦牛、舍饲犏牛和放牧牦牛间差异不显著;舍饲牦牛背最长肌的肌纤维直径显著高于舍饲犏牛;舍饲牦牛股二头肌的肌纤维直径极显著高于放牧牦牛,臂三头肌的肌纤维直径无显著差异,臂三头肌的肌纤维密度差异极显著。

Taking the 4.5-year-old male yaks and yak-cattles in Xiaojin county as the research object,which were treated by house feeding and grazing feeding.After slaughter,the muscles of the longissimus dorsi,triceps and biceps of the yak,yak and grazing calves are collected to measure the muscle fiber diameter,muscle fiber density,intramuscular muscle fiber content,and intramuscular connective tissue content.The results showed that the muscle fiber diameter and intramuscular muscle fiber content of the yak,yak-cattles and grazing yaks were not significantly different among the three muscle parts;the muscle fiber density of the triceps of the house feeding yak was significantly higher than that of the biceps femoris;the intramuscular connective tissue content of the longissimus dorsi and triceps of the house feeding yak-cattles was significantly higher than that of the biceps femoris;The muscle fiber density of the grazing feeding yaks and yak-cattle,and the intramuscular connective tissue content of the house breeding and grazing yak were not significantly different among the three muscle parts;the intramuscular muscle fiber content and intramuscular connective tissue content of the muscles in the three parts were not significantly different between the house breeding yak,house breeding yak-cattle and the grazing yak;the muscle fiber diameter of the longissimus dorsi of the house feeding yak was significantly higher than that of the house feeding yak-cattle;the muscle fiber diameter of the biceps femoris of the house feeding yak was significantly higher than that of the grazing yak.There was no significant difference in the muscle fiber diameter of the triceps muscles.The difference in muscle fiber density of the triceps was extremely significant.