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《Animal Husbandry & Veterinary Medicine》 2008-12
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Pathogenicity of three field strains of Eimeria tenella

LIU Jin-biao1,XUE Jin2,MENG Qing-hua3,PENG Hao1,ZHANG Yan1,XU Jin-jun1,TAO Jian-ping1(1.College of Veterinary Medicine,Yangzhou University,Yangzhou 225009,China;2.Dongtai County Service Station for Animal Husbandry and Veterinary Medicine,Dongtai 224220,China;3.Yancheng Biology Engineering Higher School,Yancheng 224051,China)  
The pathogenicity of three field strains of Eimeria tenella,EtCZ-1,EtCZ-2 and EtCZ-3 was compared according to clinical symptom,gross pathology,weight gain,lesion score and mortality after the chickens were infected with the dose of 4×104 and 8×104 sporulated oocysts per chicken,respectively.The results were that the clinical symptoms and the gross intestinal pathology were similar in all infected chickens.The weight gains of infected groups were significantly different from those of the control groups(P0.50).The rates of relative gains were reduced to 74.4%~83.2%,68.7%~72.2% and 70.6%~74.4%,respectively.The bloody stools were discharged from infected chickens at 108 h post-inoculation(PI),and reached the peak from 120 h to 144 h PI.The lesion scores and occysts production became larger with the increase of dose.The survival rates were 100% except the group with 8×104 of EtCZ-1 sporulated oocysts(90%).It suggested that three strains of E.tenella were similar to each other in their pathogenicity.
【Fund】: 江苏省自然科学基金项目(BK2007079);; 扬州大学高层次人才科研启动基金(2005)
【CateGory Index】: S852.7
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