Funding for this research was provided by:
National Transgenic Science and Technology Program (2018ZX08009-26B, 2016ZX08006003-004)
Fundamental Research Funds for the Central Universities (2662018JC002)
National Swine Industry Technology System (CARS-35)
Received: 12 August 2020
Accepted: 9 November 2020
First Online: 19 November 2020
Ethics approval and consent to participate
: All experiments were conducted according to the guidelines for the care and use of animals by the Huazhong Agricultural University Institutional Animal Care and Use Committee.
: Not applicable.
: The authors declare that they have no competing interests.