【单选题】【消耗次数：1】
鸡传染性法氏囊病的危害在于
①
产蛋下降
②
免疫抑制
③
营养吸收障碍
④
孵化率下降
参考答案：
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马立克氏病是由病毒引起的鸡肿瘤病和免疫抑制性疾病，目前采取最重要的防制措施是
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