Acknowledgments
This study was supported by the Key Research Project of National Science
and Technology (2016YFD0500108, 2016YFD0501003), the Chinese Natural
Sciences Foundation (31672572), the Fundamental Research Funds for the
Central Institutes Program (2019JB06), the Science and Technology
Promoting Agriculture Innovation Project of Shanghai (2019 no. 3-3), and
the Foundation of Shanghai Key Laboratory of Veterinary Biotechnology
(klab201712).