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 国家开放大学 / 动物营养与饲料

下列选项中不属于益生素合理使用要点的是()。
活菌制剂容易受到环境因素的影响,如温度、水分、酸碱度等
需要考虑活菌制剂的稳定性
需要考虑动物消化道的内环境
需要保证饲料中蛋白质的高水平含量
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