Funding for this research was provided by:
National Natural Science Foundation of China (31572371, 31472078)
Received: 15 September 2020
Accepted: 15 March 2021
First Online: 25 March 2021
: All procedures in this study involving animals were carried out in accordance with the guidelines for the care and use of experimental animals established by the Ministry of Science and Technology of China (Approval Number 2006–398), and the work was approved by the Animal Care and Use Committee of Chinese Academy of Agricultural Sciences and Ningxia Academy of Agriculture and Forestry Sciences in China. The written informed consent to participate was obtained from Yanchi Tan sheep conservation farm in the Ningxia Autonomous Region, China.
: Not applicable.
: The authors declare that they have no competing interests.