Application of bioactive substance in alfalfa on animals

Alfalfa is good source for bioactive substance such as polysaccharides saponins and flavonoids which can significantly affect the growth, reproductive performance and immune function of animals. In the present paper, we discussed the biological functions and the latest achievements of bioactive substance around the world. The bioactive substances can be used as feed additives in animal because the appropriate amount of alfalfa active substances may increase immunity by promoting the level of lymphocyte, and have antioxidant functions by improving the activities of glutathione peroxidase, inhibiting malondialdehyde, can also improve production and reproductive performance.