题目内容
(请给出正确答案)
[单选题]
奶牛日粮中精粗饲料比例要适当,一般以()较为适宜。
A.精料占40.0%~60.0%,粗纤维占15.0%~17.0%
B.精料占15.0%~17.0%,粗纤维占40.0%~60.0%
C.精料占4.0%~6.0%,粗纤维50.0%~70.0%
D.精料占20.0%~30.0%,粗纤维占5.0%~7.0%
E.精料占20.0%~30.0,粗纤维占50.0%~60.0%
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A.精料占40.0%~60.0%,粗纤维占15.0%~17.0%
B.精料占15.0%~17.0%,粗纤维占40.0%~60.0%
C.精料占4.0%~6.0%,粗纤维50.0%~70.0%
D.精料占20.0%~30.0%,粗纤维占5.0%~7.0%
E.精料占20.0%~30.0,粗纤维占50.0%~60.0%