合症是当今养鸡业中的常见

　　一 发病原因

　　1．球虫感染

　　小肠球虫在肠粘膜上大量繁殖，导致肠粘膜增厚、脱落、出血， 造成饲料不能吸收。同时由于球虫繁殖耗氧量增加导致肠粘膜组织产生大量乳酸，使肠内pH值降低，肠内有益菌减少， 有害菌大量繁殖，造成消化能力下降，饲料消化不良。
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　　2．肠道菌群失调

　　目前由于滥用抗生素等原因。引起肠道内环境改变使肠道内有益菌减少，而有害菌趁机大量繁殖，肠道消化酶的消化功能下降，饲料消化不良，有害菌、球虫及其产物刺激肠道的平滑肌收缩． 使肠蠕动加快、加强，饲料消化时间减少．导致鸡只消化不良。

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