Feed salt is also known as feed additive sodium chloride. In the body of the animals, chloride ion and sodion mainly exist in the body fluid and soft tissues to maintain the osmotic pressure, adjust the acid-base equilibrium and control the water metabolism, which are the mineral elements required by normal growth and development of the animals. With a saline taste, sodium chloride can improve the palatability of the feed, enhance the appetite, help digestion and absorption of the nutrient substances and improve the utilization rate of the feed. Feed additive sodium chloride is an important mineral substance among the feed for livestock and poultry as well as a necessary substance for the livestock and poultry to maintain vital activity.