5Saif Y M,Fadly A M,Glison J R,et al. Disease of poultry [M].12 ed.Ames,USA:Iowa State University Press, 2008:514-568.
6Boyce-Jacino M. T., O" Donoghue K. and Faras A.J.Multiple complex families of endogenous retroviruses are highly conserved in the genus Gallus [J].Joumal of Virulogy,1992, 66 (8):4919-4929.
7SUN SH,CUI ZZ. Epidemiological and pathological studies of subgroup J avian leukosis virus infectious in chinese local"yellow"chicken [J].Avian Pathology, 2007,36 : 221-226.
8Grzegorz W,Elze S,Wojiech K. Rapid detection of Mareks disease virus in feather follicles by loop-medi- atci amplification [J], Avian Dis, 2011,55:462-467.
9Witter R L,Calnek B W,Buscaglia C,et al. Classifica- tion of Marek's disease viruses ccording to pathotype: philosophy and methodology [J]. Avian Pathol,2005,34:75-90.
10Gong Z,Zhang L, Wang J,et al. Isolation and analysis of a very virulent Marek's disease virus strain in China [J]. Virol J,2013,5(10):155.
