Res Vet Sci 2020 Dec 22;134:120-126. Epub 2020 Dec 22.
College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai'an City 271018, China; Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Tai'an City 271018, China; Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Shandong Agricultural University, Tai'an City 271018, China. Electronic address: