Investigation of coccidiosis in yaks in part areas of Xizang
The aim was to investigate the infection rate and species of coccidioides in yaks in part areas of Xizang.A total of 245 yaks fresh dung samples from Rikaze City(Saga County&Yadong County),Naqu City(Jiali County&Nierong County),and Gaize County from Ali Prefecture were examined using flotation method.The results showed that the average infection rate of yak coccidioides in parts of Xizang was 71.43%.The infection rates of yak coccidia in Saga County,Yadong County,Nierong County,Jiali County,and Gaize County were 82.61%(38/46),80.25%(65/81),68.97%(20/29),68.18%(30/44)and 48.89%(22/45),respectively.The highest intensity of infection was 15 000(OPG);the mixed infection rate among the 175 positive cases of coccidiosis in calves recached 100.00%.A total of 6 species of Eimeria were identified,namely E.zuernii,E.bovis,E.wyomingensis,E.alabamensis,E.cylindrica and E.bukidnonensis.Yak coccidiosis has a medium-high infection rate in part areas of Xizang,the pathogenic parasites as E.zuernii and E.bovis have been identified in the study areas,and its harm to local yaks is still worth to be further studied.
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