Funding for this research was provided by:
Ningxia Department of Science and technology (2019BBF02005)
Received: 15 April 2020
Accepted: 6 November 2020
First Online: 23 November 2020
Ethics approval and consent to participate
: This study was submitted to and approved by the Laboratory Animal Ethical and Welfare Committee of Ningxia University (Approval No. NXU-ACAU-2018-124). All owners of farms who participated in this study provided their verbal consent based on the long and tight cooperative fellowship between the owners and our department, which was approved by Laboratory Animal Ethical and Welfare Committee of Ningxia University.
: Not applicable.
: All authors declare that they have no conflict of interests.