Funding for this research was provided by:
National Key R&D Program of China (2017YFD0501200)
Received: 8 May 2019
Accepted: 30 October 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: The collection and manipulation of blood samples were approved by the Animal Ethics Committee of the Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences. All sampling procedures were handled in accordance with the Animal Ethics Procedures and Guidelines of the People’s Republic of China.
: Not applicable.
: The authors declare that they have no competing interests.