Efficacy of oral vaccination against swine erysipelas in growing-finishing pigs in a clinically infected Slovakian pig herd

In a large Slovakian growing-finishing pig production unit, the effects of oral vaccination against swine erysipelas (SE) were investigated in three groups of pigs of 10 weeks of age. In group 1, the pigs were vaccinated intramuscularly at 1 and 3 weeks after arrival in the growing-finishing barn using an Erysipelothrix rhusiopathiae bacterin. Group 2 pigs were vaccinated at the same time as group 1 using an oral avirulent live SE vaccine administered through drinking water; the pigs in the third group were placebo treated. Clinical signs of acute SE, arthritic changes, average daily weight gain (ADG), feed conversion ratio, and mortality were evaluated. None of the pigs in groups 1 and 2 but 31.7% of the control animals (group 3) showed typical clinical signs of acute SE. More (P<0.01) non-vaccinated pigs had chronic arthritic changes compared with groups 1 and 2. No significant differences in mortality were recorded between the groups. Groups 1 and 2 had higher (P<0.05) ADG and lower feed conversion ratios compared with group 3 pigs. The results demonstrated that the oral avirulent live culture was efficacious in significantly reducing the clinical symptoms caused by E. rhusiopathiae infection, so enhancing the pigs' performance.     

猪丹毒的诊疗

20 0 2年 3月中旬 ,作者应世界自然基金会北京办事处长沙办公室的邀请到长江项目基地调查了解替代产业 -牲猪养殖情况 ,发现当地正在流行猪丹毒 ,便立即对此病进行了调查研究。通过调查、诊断和治疗等研究发现此次流行的猪丹毒具有一些特点 ,特报告如下。1　流行病学　此病于 2 0 0 2年 1月初开始发生 ,由于当地兽医误诊为仔猪副伤寒 ,未采取有效措施制止 ,并逐渐传播开来 ,形成了地方流行性 ,给当地养猪户带来了很大的损失。此次流行除了具有炎热天气、猪发病多的特点以外 ,还有以下一些特点 :大小猪、仔猪、母猪和公猪都发病 ,以怀孕、哺…     

基于ARIMA的猪丹毒预测模型研究

为研究ARIMA时间序列模型预测猪丹毒(SE)的可行性,本实验选取兽医公报发布的我国某省SE的发病数据,对2005年1月～2009年6月该地区的SE发病资料进行模型构建与拟合,采用构建的模型对2009年7月～2009年12月的SE发病率进行预测并验证预测效果.结果显示ARIMA(2,1,0)模型可以拟合既往时间段上的发病率序列,预测结果显示MSE为0.203×10-10、MAPE为0.293,该模型可以预测未来SE的发生.