2Sais Y M. Diseases of Poultry[M]. Eleventh edition. Ames:Iowa State Press,2003.
3Yabin D, Xingyou L, Mei L, et al. The life cycle and pathogenicity of coccicium Eimeria nocens in domestic goslings [J]. Journal of Parasitology,2005,91(5) : 1122-1126.