Commercial egg and meat birds have high requirements for protein and energy and do not tolerate high fibre levels in their diets.
商业蛋禽和肉禽对蛋白质和能量的需求很高，并且不能接受高纤维饲料。
2
Most tropical deforestation is the result of expanding commercial ranching and agriculture, driven by rocketing domestic and global demand for food, fibre and biofuel.