Funding for this research was provided by:
Guangdong Modern Agricultural Pig Industry Technology Promotion System Construction Project (2016LM1103)
Received: 24 March 2021
Accepted: 15 June 2021
First Online: 1 July 2021
: The authors have declared that the Ethical Statement is not applicable in the current manuscript.
: All listed authors have read the manuscript and agreed to the publication of this research.
: The authors have declared that there are no conflicts of interests.