Jiayunduo is manufactured from chelates of hydroxyl amino acids. Adding the product to feed can boost the reproductive capability of sows. The product is suitable for used in feed for gestating or lactating sow as it meets their physiological needs for nutrition. The properties of the product are chemically stable. safe for feed use, non-poisonous, highly effective. Trial conducted have show that the product is easily absorbed and utilized by animals and it can boost sow's reproductive capability and raise the survival rate of new born piglets.