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The yak is critical for the life and economic activity of the people on the vast and inhospitable Qinghai-Tibetan plateau and in the surrounding mountainous areas. The late Professor Cai Li went so far as to suggest that without the yak no civilisation would have developed in this region (personal communication ; Cai Li was a distinguished scholar at the South-west University of Nationalities who had dedicated himself to the lifelong study of the yak and the role of the yak in the life of the people).
From its very beginnings, the domesticated yak, descended from the wild yak, made not only the most important contribution to the livelihood of the herders and their families but was also involved in their culture, religion and social life.
The economically most important aspects of the yak's fitness traits and the productive and reproductive attributes of the yak will now be briefly summarised. Fuller descriptions and details can be found in Wiener, Han and Long (2003).
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