大通牦牛骨骼肌微血管密度增龄性变化特点

Age Related Changes of Microvessel Densities in Skeletal Muscle of Datong Yak

本研究以不同生长期大通牦牛作为研究对象,并以平原黄牛作对照,对生长发育过程骨骼肌微血管密度(MVD)进行测定。结果表明,大通牦牛和平原黄牛骨骼肌微血管密度,随着年龄的增长,总体表现为上升的趋势,但均在30日龄先降到一个相对低点,然后逐渐升高,到成年时达到最高,差异极显著(P<0.01)。相同发育阶段大通牦牛骨骼肌微血管密度均高于平原黄牛,且差异极显著(P<0.01)。结果提示,大通牦牛通过增加骨骼肌微血管密度来提高其在低氧环境中获取氧的能力,且这种特点作为生物学性状固定下来,并且通过遗传传递给下一代。

The changes of microvessel density in skeletal muscle of different developmental stages of yaks and cattle were researched to reveal the adaptation of yak to hypoxia environment.The result showed that the change tendency of microvessel density of skeletal muscle in yaks was same as that in cattle.The microvessel density was lowest at 30 day,then increased gradually and got a peak at adult.The differents were significant among those groups（P0.01）.The microvessel density of yak skeletal muscle was higher strikingly than that of the same age cattle（P0.01）.According to these results,we got the conclusion that yaks can get more oxygen by increasing the microvessel density in skeletal muscle,and these characters can be inherited as a biological character.