牦牛是高原土生动物,柴达木黄牛是高原移居动物。我们在海拔2,900米处对健壮的成年牦牛、黄牛各5头进行了肺动脉压、颈动脉压、右左心室重量比、Hb、Het 等参数的测定。证实牦牛肺动脉压明显低于黄牛。两者均无右室肥厚,但均具有高血容量、高心输出量型高血压状态和强大的左心的特点。并深信这一特点是它们能生存于高原低氧环境的重要因素。 Yaks are plateau native animals and Qaidam cattle are plateau migrants. We measured the pulmonary arterial pressure, carotid arterial pressure, right-left ventricular weight ratio, Hb, Het and other parameters of healthy adult yaks and cattle at 2,900 meters above sea level. Confirmed yak pulmonary artery pressure was significantly lower than cattle. Both had no right ventricular hypertrophy, but both had high blood volume, high cardiac output-type hypertension and a strong left heart characteristic. And convinced that this feature is that they can survive in the plateau hypoxic environment, an important factor.