Funding for this research was provided by:
National Natural Science Foundation of China (31460671, 31760735)
Guangxi Science and Technology Bureau (AA17204057-1)
Natural Science Foundation of Guangxi Province (2016GXNSFBA380219, 2018GXNSFAA294048)
Received: 1 February 2019
Accepted: 19 December 2019
First Online: 27 December 2019
Ethics approval and consent to participate
: For all the serum and stool samples used in this study, written consents were obtained from farm owners and all procedures were carried out in strict accordance with the Animal Ethics Procedures and Guidelines of the People’s Republic of China. All the animal protocols in this study were approved by the Ethics Committee of Guangxi University.
: Not applicable.
: The authors declare that they have no competing interests.