單項(xiàng)選擇題奶牛進(jìn)入泌乳中期和后期,日糧中干物質(zhì)應(yīng)占體重的()

A.2.0%-2.2%
B.3.0%-3.2%
C.3.5%-3.8%
D.4.0%-4.5%


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