Funding for this research was provided by:
National Natural Science Foundation of China (31702311)
Natural Science Foundation of Gansu Province (No. 17JR5RA141)
Text and Data Mining valid from 2019-05-02
Received: 21 August 2018
Accepted: 22 April 2019
First Online: 2 May 2019
Ethics approval and consent to participate
: All animals were handled with the assistance of veterinarians from the local veterinary institute and animal health and epidemiology centre. All procedures in this study were approved in strict accordance with good animal practice following the guidelines of the Animal Care and Use Committee of Gansu Agricultural University and performed in accordance with animal welfare and ethics.
: Not applicable.
: The authors declare that there are no competing interests regarding the publication of this paper.
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