A.飼料利用率高 B.飼養(yǎng)周期短 C.消化機能不健全 D.飼養(yǎng)密度大、勞動效率高 E.生長速度快
A.50%~55% B.55% C.60%~65% D.65%~70% E.40%~72%
A.50% B.60% C.70% D.80% E.90%