题目内容

瘤胃臌气的预防措施包括（）。

A. 限制饲喂易发酵牧草
B. 在放牧前，先喂给青干草、稻草
C. 控制在青绿、幼嫩牧草地的放牧时间
D. 定期投服抗泡沫剂
E. 将油做成乳化剂，喷洒在要饲喂的草地上

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