6Yang Y F,Wang H N,Yang G Y,et al.Epidemiological survey and control of enterozoic diseases of yak and Tibetian sheep in the Sichuan westnorth grassland[C] //Proceedings of fourth international congress on yak,Chengdu,China,2004.
7Bandyopadhyay S,Pal P,Bhattacharya D,et al.A report on the prevalence of gastrointestinal parasites in yaks(Bos poephagus)inthe cold desert area of North Sikkim,India[J].Trop Anim Health Prod,2010,42:119-121.
8Wang M,Wang Y H,Ye Q,et al.Serological survey of Toxoplasma gondii in Tibetan mastiffs(Canis lupus familiaris)and yaks(Bos grunniens)in Qinghai,China[J].Parasites&Vectors,2012(5):35.
9Liu Q,Cai J,Zhao Q,et al.Seroprevalence of Toxoplasma gondii infection in yaks(Bos grunniens)in northwestern China[J].Trop Anim Health Prod,2011,43:741-743.
10Levine N D.Protozoan parasites of domestic animals andof man[M].2ed ed.Burguess Publishing Company,USA,1973:164-233.