TSAA requirements for nursery and growing pigs

摘要

The use of synthetic amino acids in swine nursery and growing diets is a common practice implemented throughout the world. The majority of the research to date has focused on the use of synthetic lysine. Researchers have spent considerable time and money determining the lysine requirement and the maximum amount of synthetic lysine that can be fed in a practical pig diet. With the present knowledge of lysine requirements, drastic variations in ingredient costs, and environmental pressures to lower crude protein, it has become increasingly more important to know the requirements for the next limiting amino acids. Methionine, threonine, and tryptophan are available in synthetic forms. These amino acids are also considered to be the next limiting aminoacids in swine nursery and grower diets. A better understanding of the pigs' requirements for each of these amino acids will result in lower feed costs, improved diet formulations, and a reduction in nitrogen excretion.