大肠杆菌O125对商品肉鸡致病性的研究

Asmaa Abd Elatiff, A. A. El-Sawah, M. M. Amer, Al-Hussien M . Dahshan, H. Salam, Salama A. S. Shany
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引用次数: 3

摘要

商品肉鸡经常以碰撞杆菌病的形式感染大肠杆菌血清型,其特征是最初的呼吸道感染(空气囊炎),随后是全身性败血症、周围性肝炎和心包炎。本研究旨在研究从肉鸡心包炎、空气囊炎和肝周炎中分离鉴定的大肠杆菌O125对肉鸡的致病能力,确定大肠杆菌血清群O125对肉鸡的致病性,并进行益生菌(Guardyazin-m)或抗生素(环丙孕酮20%)防治试验。将雏鸡分为对照阴性组、口腔感染组、皮下感染组、益生菌处理组和抗生素处理组。记录大鼠的临床体征、死亡率、各项性能指标及死后检查结果,并观察肝、肠的病理变化。益生菌组在控制大肠杆菌O125感染方面效果最好,其次是抗生素。综上所述,大肠杆菌O125血清组在实验接种时对雏鸡具有致病性,因此应特别注意大肠杆菌O125作为感染禽类的病原体。益生菌在预防大肠杆菌感染和提高雏鸡生产性能参数方面具有重要价值。测定其对采食量、周增重和饲料转化率的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pathogenicity of Escherichia coli O125 in commercial broiler chickens
Commercial broiler chickens are frequently infected with Ecoli serotypes in form of collibacillosis whichcharacterized as an initial respiratory infection (air sacculitis) followed by generalized septicemia, perihepatitis andpericarditis. The present work aimed to study the ability of E.coli O125 previuosly isolated and identified fromdiseased broilers suffered from pericarditis , airsacculitis and perihapatitis to induce a disease and The current studyaimed to determine the pathogenicity of E. coli serogroup O125 in broiler chicks, a trial of prevention and treatmentusing probiotic ( Guardyazin-m) or antibiotic (Cipronate20%). The chicks were divided into seven groups includingcontrol negative, orally infected , subcutenously infected , probiotic treated group, and finally antibiotic treatedgroup. The clinical signs, mortality, performance parameters and postmortem examination as well as thepathological changes in liver and intestine were recorded. The probiotic group gave the best results in controllinginfection by E. coli O125 followed by antibiotic. In conclusion, the E. coli O125 serogroup was pathogenic to chickswhen experimentally inoculated, so particular attention must be directed toward E. coli O125 as a pathogen infectingbird. Also probiotics was of great value in protection against the E. coli infection and improve the performanceparameters of chicks . Its effect on feed consumption , weekly body weight gain and feed conversion rate (FCR) wasdetermined.
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