Each hectare (2.47 acres) of corn planted in the United States will yield enough utilizableprotein to feed 12 people 60 grams of protein per day for one year.
在美国，每公顷(2.47英亩)种植的玉米，一年可以生产出足够给12人每天吃60g的可利用蛋白质。
2
Experiment 2. Effects of dietary fiber levels on dietary fibers and proteinutilizable efficiency of emus.