牦牛遗传标记的研究

本研究结果表明，四川、西藏的牦牛在染色体和血液蛋白2种遗传标记上具有较为丰富的遗传多样性；而在所研究的DNA分子标记中多样性相对较贫之．这些遗传标记的这些差异是耗牛能够适应复杂多样的高原气候环境条件的物质基础，也为研究牦牛的起源、演化和分类，以及开展标记辅助选择提供了理论依据．同时，说明牦牛虽然是家养动物中地理分布范围极其有限的家畜，但由于其产区的自然生态环境和社会生态环境条件的不同，在长期人工选择和自然选择的作用下，遗传结构巳发生了较大的变异，形成了不同的生态类型或地方品种．

A study on genetic diversity of chromosome and blood protein in the yak

Our research results show that there are many genetic diversities of chromosome and blood protein characteristics in Sichuan and Tibet yaks. These genetic diversities are the material base for yaks to adapt itself to the complicated and changeable plateau climate, helpful not only for knowing the yak's origin, evolution and classification, but also for providing theoretical basis for protection and utilization of the yak resources. Furthermore, the results explain that although yak is scattered in an unusually limited area, variation on its genetic structure has happened, forming some ecological types or breeds under the comprehensive factors such as the unique natural and social ecological environments, and the natural and artificial selections.