【摘要】 作者对两种家鸭球虫的致病力进行了试验,并用八种抗球虫药对北京鸭泰泽球虫病进行了效果观察。试验证明毁灭泰泽球虫的致病力强,分别用2×10~4和24×10~4孢子化卵囊感染二周龄雏鸭各10只,用前一剂量的死亡1/10,后者死亡3/10。又以2×10~4-128×10~4个孢子化卵囊分别感染三周龄雏鸭100只,分10组,每组10只,另有10只鸭不感染,用为对照。感染2×10~4-15×10~4卵囊者均于感染后第四天出现拉稀。感染31×10~4以上的各组,均于第四日出现不食,精神萎顿,血便,死亡率最高为4/10。93×10~4组减重量为严重,其增重率仅相当于对照组的24.7％。菲莱氏温杨球虫的致病力较弱,以506×10~4个孢子化卵囊感染八日龄雏鸭,仅出现轻微症状,未见血便和死亡。用252.3×10~4个毁灭泰泽球虫孢子化卵囊感染雏鸭90只,将不同药物分别混入饲料中喂服,连用六天,其结果为:磺胺六甲氧嘧啶按饲料量0.1％喂服,疗效果最好,感染10只雏鸭无一发病,亦无死亡,对增重无不良影响。其次为广虫灵,剂量0.05％,感染10只雏鸭,无一发病,亦无死亡,但对增重稍有影响。其它六种药,以常山酮(剂量0.05％)最差,无抗毁灭泰泽球虫功效,感染10只雏鸭,全部发病,10/10死亡。盐霉素(剂量0.005％),氨丙啉(0.0125％),球痢灵(0.0125％),力更生(0.05％)和氯苯胍(0.0033％)五个组各10只雏鸭,发病率均为10/10,死亡率分别为7/10,5/10,4/10,4/10和4/10,对增重均有不良影响,其中以球痢灵对增重影响最大。更多还原

【Abstract】 Thd pathogenicity of T. perniciosa, a coccidian parasite of Pekin duck, had been studied. The authors found that T. perniciosa is the most serious coccidian pathogen of ducklings. In the first experiment, the authors inoculated two groups of ducklings with different dosage of sprulated oocyst, and obtained the following results: In the second experiment, ten groups of total 100 ducklings at 8 weeks of age had also been inooulated with sporulated oocysts from 2×10~4 to 128×10~4 in numbers. On the fourth day after inoculation, the groups infected with 2×10~4 to 15×10~4 oocysts showed diarrhea. Those groups infected more than 31×10~4 oocysts, all the ducklings showed anorexia, unthrifty and blood-stained feces, the highest mortality was 4/10. The group infected with 93×10~4 oocysts showed the lowest weight gain rate, only 24.7% of the control group, The pathogenicity of W. philiplevinei is mild, ducklings at 8 days of age inoculated with 506×10~4 sporulated oocysts just showed light symtpoms. The efficacy of eight kinds of coccidiostats were tested. The drugs were SMM, Clopidol, Stenorol (Halofuginol), Saliomycin, Amprolium, Zoalene, Nicrazin (Nicarbzin 2.5%) and Robenidine. The authors divided 90 ducklings into nine groups, each group contained 10 ducklings. One group was used as control, all the other groups were inoculated with sporulated oocysts of T. perniciosa at a dosage of 252. 3×10~4 oocysts per bird, and each group administered a different kind of coccidiostat. The results showed that SMM was most effective when fed at 0.1% in diet for six days. Clopidol at 0.05% in diet for six days obtained the same result, but the weight gain rate was lighty decreased. Stenorol 0.05% in diet was ineffective, all the birds were heavily inflected, showed bad symptoms, the mortality was 10/10. Saliomycin 0.005%, Amprolium 0.0125%, Zoalene 0.0125%, Nicrazin 0.05% and Robenidine 0.0033% in diet were also ineffective, the morbidity was100%, and the mortality was 7/10, 5/10, 4/10 4/10 and 4/10 respectively.更多还原