【正文】
N2 A ni m al s Cr o ps F i gur e 1. Pri m ar y F ood C hai n ( F r om L an y on,1996) Soi l Sun D e pose r s Low Efficiency of Nutrient Transfer in Food Chain output E(%)= input 養(yǎng)分通過動物后的分流比例 食入 100% 產(chǎn)品 15 20% 環(huán)境 8085% Cows 三、動物營養(yǎng)與動物生產(chǎn)的關(guān)系 M Relationships of nutrient allowance with animal performance and environmental risk Effect marginal utility of animal absolute animal performance performance environmental loading A B nutrient