增益素对肉鸡抗大肠杆菌感染和促进增重的作用

Effects of Polyactin A on Anti-infection of E.Coli and Promoting Weight Increase in Broiler

研究了增益素对肉仔鸡抗致病性大肠杆菌的作用及对肉仔鸡增重的影响。将150只艾维因肉仔鸡随机分成5组,每组30只。1～4组为实验组,5组为对照组。第1、2组鸡在1～14日龄以每天0.2mg/kg体重的量饮水饲喂增益素,第3、4组在1～7日龄以同等量饮水饲喂增益素,所有鸡在7日龄时以3亿/只的含菌量人工感染致病性大肠杆菌。待有发病症状后,第2、3组喂庆大霉素,1、4组不喂庆大霉素,第5组不用增益素也不用庆大霉素,观察各组发病及死亡情况,记录各组鸡的日增重并计算料肉比。结果表明,饲喂增益素后的鸡对致病性大肠杆菌的感染具有一定抵抗力,可降低发病率,还可以促进鸡的生长,增加日增重,从而提高饲料转化率。

The effects of polyactin A on the anti-infection of pathogenic E. Coll. and the weight increase of broiler chickens were studied. The 150 broiler chickens were randomly divided into 5 groups and there were 30 chickens in each.And the first to the fourth group are the cxperiment groups while the fifth is the control, The chickens in groups 1 and 2 were fed with the PAA by drinking the water with 0.2 mg/kg of body weight every day at I ~ 14 days of age, while the chickens in groups 3 and 4 were done the same by drinking the equal water at 1-7 days of age. All chickens were infected by pathogenic E. Coli. by 300 million germ every chicken at 7-day-old. When they became ill and exhibited typical symptoms, the chickens in groups 2 and 3 were fed with gentamicin while the chickens in groups 1 and 4 didn＇t, and the chickens in group 5 were fed with neither the PAA nor the gentamicin. The ill and dead chickens of each group were observed, and the weight increase every day of each group was recorded and then the fodder-meat rate was computed. The results show that the chickens fed with PAA was of certain resistance to the infection of athogenic E. Coll., the illness rate declined, the growth of chickens was promoted, and the weight increase every day increased, and therefore the conversion rate of the feed enhanced.