A.30~40 B.61.1~75.6 C.38.4~56.7 D.85.3~97.1
A.10% B.15% C.20% D.30%~40%
A.按維持需要供應(yīng) B.短期優(yōu)飼 C.限制營養(yǎng) D.自由采食