题目当犊牛饮奶时会发生__________,如果奶桶放置不当,乳汁会溢入瘤胃中,引起__________。当犊牛饮奶时会发生__________,如果奶桶放置不当,乳汁会溢入瘤胃中,引起__________。题目解答答案食管沟反射;发酵