Funding for this research was provided by:
the Key Research and Development Project of Shaanxi Province (2020NY-017)
the Animal Husbandry Special fund of Department of Agriculture and Rural Affairs of Shaanxi Province (XN14)
the State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences (SKLVEB2019KFKT007)
Received: 9 March 2022
Accepted: 12 August 2022
First Online: 27 October 2022
: This study was conducted strictly according to the legal requirements of guide for the Care and Use of Laboratory Animals of the Ministry of Health, China and approved by the Research Ethics Committee of Northwest A&F University. Sampling was permitted by Tibetan sheep owners and no specific authority was needed for sample collection.
: Not applicable.
: The authors declare that they have no conflict of interests.