摘要
将柔嫩艾美耳球虫鸡胚及药物适应株（Ｐ２５、Ｐ３０）和巨型艾美耳球虫早熟选育株（Ｐ２２、Ｐ２８），分别连续回鸡６代，测定试验鸡的肠道病变及肠道内容物的卵囊密度。结果显示，试验鸡的肠道平均病变程度（１．０以下）明显低于对照组，而肠道内容物的卵囊密度则基本相似，表明弱毒虫株无返祖现象。
day-old chickens were inoculated with two eimbryo-related attenuatedstrains of E.tenella(P25 and P30)and two precocious attenuated strains of E. maxima(P22 andP28);respectively;for 6 serial passages for measuring the pathogenicity reversion of theattenuated strains. The results showed that no pathogenicity reversion of the attenuatedstrains was found in tested chickens based on the similarity in both lesion score and oocystdensity in contents of intestines between the attenuated strains and the control strains.
出处
《上海农业学报》
CSCD
1996年第4期63-65,共3页
Acta Agriculturae Shanghai
基金
农业部畜牧业"八五"重点项目
关键词
艾美耳球虫
弱毒虫株
返祖性
Eimeria tenella
E. maxima
Attenuated strain
Pathogenicity reversion
