Eimeria acervulina precocious strain 堆型艾美耳球虫早熟株
The characteristics of the precocious strain is genetically stable and can't reinstate by relaxing the selection pressures.
并且，早熟株的弱毒性和早熟性具有遗传稳定性，通过放松选择压力反复传代后无恢复现象。
The biological characteristics of Tangyin strain of Eimeria brunetti isolated in Tangyin County, Henan province, China and its precocious line were studied.
作者对来自我国河南省汤阴县的布氏艾美尔球虫及其早熟株的生物学特性做了较为详细的研究。
The precocious line was much less pathogenic than the parent strain judged by mortality and weight gains, but its immunogenicity was reduced to some degree.
根据死亡和增重判断早熟株的致病性较亲本株大大降低，但其免疫原性也有一定程度的下降。
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