Corn stover and alfalfa hay are main forage and widely used in dairy production, In order toproduce a marked synergistic action, and enhance their utilization efficiency, the optimization ratio ofcorn stover and alfalfa hay should be studied. Under the condition of the same addition ofconcentration and corn silage, the experiment researched the effect of different ratio of corn stoverand alfalfa hay on digestibility and nitrogen metabolism of cow, and determine dairy cattleperformance of the fora...