Feed grade L-Threonine is often packed in common woven bags and placed in piles. Although it seems to us that livestock require little amount of L-Threonine, it is essential in reality. Because the synthetic amount of L-Threonine in livestock is not enough to meet their daily consumption, farmers need to choose appropriate method and amount according to the type and growth cycle of the livestock, preventing it from becoming a reason for restricting the growth of livestock.