Received: 14 June 2021
Accepted: 16 November 2021
First Online: 25 January 2022
: This study was approved by the Research Ethics Committee of Shandong Agricultural University. There were no vulnerable populations involved, and no endangered species were used in the experiments. Farm managers gave permission for their animal samples to be used in this study.
: Not applicable.
: The authors declare that they have no competing interests.