Funding for this research was provided by:
National Natural Science Foundation of China (32072825)
Sichuan Science and Technology Program (2020YJ0344)
Agriculture Research System of China (CARS-42-17)
Sichuan Veterinary Medicine and Drug Innovation Group of China Agricultural Research System (SCCXTD-2020-18)
National Undergraduates Innovating Experimentation Project (201910626019)
Received: 20 January 2021
Accepted: 1 March 2021
First Online: 19 March 2021
: One-day-old Pekin ducklings were purchased from Grimaud Farms in Chengdu (Sichuan, China) and housed at our animal facilities with free access to food and water. This study was carried out in accordance with the recommendations of the local animal welfare bodies and the Sichuan Agricultural University ethics committee (SYXK2014-187).
: The authors declare that they have no competing interests.