The orthogonal 3 3 factorial trial involves dietary metabolizable energy(ME), crude protein(CP) and calcium(Ca:P= 1.75:1) at three levels to study their effects on green Landaise geese.

• 以饲粮能量(ME)、粗蛋白质(CP)和钙(钙磷比为1.；75：1)为试验因子。