Feed grade magnesium sulfate is used as magnesium supplement in feed processing. Magnesium is an indispensable factor in the process of bone formation and muscle contraction in livestock and poultry. It is an activator of many enzymes in livestock and poultry. It plays an extremely important role in material metabolism and nerve function in livestock and poultry. If livestock and poultry lack magnesium, it will lead to disorder of material metabolism and nerve function, imbalance of supply, affect the growth and development of livestock and poultry, and even lead to death..