Funding for this research was provided by:
National Natural Science Foundation of China (31872475)
Sichuan Veterinary Medicine and Drug Innovation Group of China Agricultural Research System (CARS-SVDIP)
Agriculture Research System of China (CARS-42-17)
Received: 20 January 2020
Accepted: 23 April 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: This animal study was approved by the Animal Ethics Committee of Sichuan Agricultural University (approval No. XF2016–17), China. Experiments were conducted in accordance with guidelines and regulations of National Institutes of Health.
: Not applicable.
: The authors declare that they have no competing interests.