Acknowledgments
This study was supported by grants from the National Natural Science Foundation of China (Grant no. 32172890 and 32002315), the China Postdoctoral Fund (Grant no. 2020M680788), the Natural Science Foundation of Heilongjiang Province (Grant no. YQ2019C032 and YQ2019C030), and the State Key Laboratory of Veterinary Biotechnology Foundation (Grant no. SKLVBF202115).