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甲砜霉素可溶性粉对人工感染鸡大肠杆菌病的药效学应用研究.doc

发布:2016-03-08约5.32千字共10页下载文档
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甲砜霉素可溶性粉对人工感染鸡大肠杆菌病的药效学研究 摘要:用试管肉汤两倍稀释法测得甲砜霉素及氧氟沙星对鸡大肠杆菌(escherichia coli)的最小抑菌浓度分别为2.0和0.1 μg/ml。按25、50和75 mg/l的甲砜霉素及10 mg/kg的氧氟沙星分别给试验性鸡大肠杆菌病患鸡内服,甲砜霉素采用全天自由饮水,氧氟沙星每天分2次内服,共用药4 d。结果药物对鸡大肠杆菌病的治愈率分别为83.3%、96.7%、100%和93.3%,而感染对照组鸡的死亡率为70.0%。甲砜霉素和氧氟沙星组的增重效果极显著高于感染对照组(p<0.01)。结果表明,甲砜霉素中、高剂量组对鸡大肠杆菌病有较好疗效。用5倍中剂量甲砜霉素作安全试验与健康对照组鸡相比未见不良反应,表明用甲砜霉素可溶性粉给鸡混饮治疗鸡大肠杆菌病安全有效。 关键词:鸡;大肠杆菌(escherichia coli);甲砜霉素可溶性粉;疗效 the pharmacodynamics study on soluble thiamphenicol powder for escherichia coli infected chicken meng zhi-min,niu xiao-fei,li lian-que,mi tong-guo,huang zhan-xin (college of agriculture, hebei university of engineering,handan 056001,hebei,china) abstract: by tube double dilution method, it was tested that the minimal inhibitory concentration(mic) of thiamphenicol or ofloxacin on escherichia coli was 2.0 μg/ml or 0.1 μg/ml, respectively. the e. coli effected chicken were taken orally with thiamphenicol at level of 25, 50, 75 mg/l, and ofloxacin at level of 10mg/kg, respectively. the thiamphenicol treat groups drank water freely and ofloxacin drank water twice a day, continued 4 days. the results showed that the cure rates were 83.3%,96.7%,100% by 25,50 or 75 mg/l thiamphenicol respectively and 93.3% by ofloxacin, the mortality of infected control group was 70.0%. the weight rise in thiamphenicol and ofloxacin treat group were significantly higher than the control group (p<0.01). it indicated that the middle and high dose of thiamphenicol had good curative effect. compared with healthy group chicken, it was not found any badness phenomenon in five times middle dose of thiamphenicol group chicken, so treatment of e. coli infected chicken with thiamphenicol was safety. key words: chicken; escherichia coli; soluble thiamphenicol powder; treatment efficacy 鸡大肠杆菌病是目前鸡养殖中常发生的一种细菌性传染病。发病率为11%~69%,死亡率为3.8%~72.9%,是鸡死淘率居高不下的主要原因之一[1]。由于大肠杆菌(escherichia coli)菌株多,易产生耐药性,临床常用药物疗效差。甲砜霉素为氯霉素的衍生物,抗菌谱与氯霉素基本相同,体内抗菌作用比氯霉素强,对革兰氏阴性菌如大肠杆菌、沙门氏杆菌、巴氏杆菌、坏死杆菌等均有较强的抗菌作用。目前甲砜霉素的制剂包括甲砜霉素片剂和甲砜霉素散剂两种[2,3]
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