Funding for this research was provided by:
National Natural Science Foundation of China (31602095)
China Agriculture Research System (CARS-37)
the Central Public Interest Scientific Institution Basal Research Fund (Y2016CG23)
Received: 24 April 2019
Accepted: 22 April 2020
First Online: 7 May 2020
Ethics approval and consent to participate
: Ethics approval all piglets used in the present study were humanely bred during the experiment and euthanized at the end of the experiment. Animal use and care protocols were reviewed and approved in writing by the Institutional Animal Use and Care Committee of Lanzhou Veterinary Research Institute. The farm owner received our oral notice of sample collection and completed the written consent statement of sample collection issued by the Institutional Animal Use and Care Committee of Lanzhou Veterinary Research Institute.
: Not applicable.
: The authors declare that they have no competing interests.