鹅艾美球虫致病性的研究

Studies on pathogenicity of Eimeria anseris

按每只鹅3×10^4和0．5×10^4个孢子化卵囊的剂量感染18日龄天山白鹅，以临床症状、肉眼病变、病理组织学变化、平均增重、病变记分和死亡率为观察指标，对鹅艾美球虫（Eimeria anseris）的致病性进行了研究。结果显示，不同剂量感染引起的临床症状和各病死鹅的肉眼病变基本相似。各感染组的平均增重与对照组均差异显著（P〈0．05）。各感染组平均病变记分与未感染对照组差异极显著（P〈0．01）；感染相同剂量组之间的平均病变记分差异不显著（P〉0．05），感染不同剂量组之间的平均病变记分差异显著（P（0．05）。不同感染剂量组均发生死亡，死亡率分别为10％～30％和60％～90％。结果表明，E．anseris具有极强的致病性。

Eighteen-day-old Tianshan geese were infected with 3 × 10^4 , 0. 5 × 10^4 of oocysts of Eimeria anseris per bird respectively to study the pathogenicity of E. anseris by using clinical symptom, gross lesion, changes of pathological histology, average weight gain, lesion score and mortality as indexes. The clinical symptoms and gross lesions were similar in birds infected with different doses of oocysts. In all of the infected groups ,the weight gains were significantly different from that in the control group（P〈0.05） and the lesion scores were very significantly different from that in the control group（P〈0.01）. Mortality of geese in all of the infected groups was 10%-30% and 60%-90% respectively. Results showed that E. anseris had marked pathogenicity in geese.