堆型艾美耳球虫早熟株与强毒株致病性和繁殖力的比较

摘要

为了比较堆型艾美耳球虫（E．acervulina）早熟株与强毒株的致病性和繁殖力情况，通过测定接种 E．acervulina 早熟株与强毒株后鸡只的精神状态、临床症状、增重、病变记分和卵囊产量，表明早熟株的排卵囊高峰出现在第5天，比强毒株提前1 d，早熟株的繁殖力是强毒株的85．8％；早熟株感染后对鸡只增重的影响较小，接种剂量在2．40×104个卵囊／羽之内时，相对增重率均大于90．0％，早熟株组鸡的肠道病变记分显著低于同剂量的强毒株组的肠道病变记分（P ＜0．05）。由此认为，该早熟株符合球虫早熟株的低致病性特性，可用于鸡球虫病早熟苗的制备。%In order to examine pathogenicity and reproductivity of virulent strain and precocious strain of Eimeria acervulina ,the mental state,clinical signs,weight gain,lesion scores and oocyst production of infected chickens were determined.The results showed that,oocyst production peak of precocious strain was at the 5th day and shorter 1 day than that of virulent strain,reproductivity of precocious strain was 85.8% of virulent strain.Precocious strain had less effect on weight gain,and all relative weight gain rates were greater than 90% when inoculated doses were below 2.40×104 oocyst per chicken.Intestinal lesion scores of precocious strain were significantly lower than that of virulent strain (P <0.05).The pathoge-nicity of the precocious strains was attenuated significantly.