1 Department of Animal Sciences, School of Agriculture, Policy and Development, University of Reading, Reading, United Kingdom.
2 State Key Laboratory for Zoonotic Diseases, Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.
3 College of Veterinary Medicine, Northwest A&F University, Xianyang, China.
4 Facultad de Medicina Veterinaria y Zootecnia, Departamento de Nutrición Animal, Instituto Literario 100 C.P. 50000, Universidad Autonoma del Estado de México, Toluca, Mexico.