Alfalfa is rich in protein and a lot of mineral elements and carbohydrates are the embodiment of its nutritional value. Among them, the crude protein content is extremely high, about 17% to 23%. The rich protein in alfalfa is mainly concentrated on the leaves, while the protein content in the chloroplast is as high as 30% to 50%, and the crude fiber content is about 42%. Therefore, alfalfa hay belongs to roughage. Although alfalfa contains more crude protein, these crude proteins can be digested. Among them, the amino acid composition is similar to the whey powder composition. Therefore, alfalfa is recognized as a high-quality fiber feed