Yaks are a significant source of wealth for the herders in the Tashkurgan area of Xinjiang. Due to long-term inbreeding, the local yak breeds have severely degenerated. The yaks are getting smaller, and the herders' incomes have been decreasing year by year. To ensure the sustainable development of the yak industry for the Tajik people,aid-Xinjiang officials from Shenzhen invited livestock expert Yan Ping.