L-Lysine HCl 98.5% Feed Grade, L-Threonine 98.5% Feed Grade, L-Tryptophan Feed Grade manufacturer / supplier in China, offering Aminal Acids 98.5% Feed Grade L-Threonine, Fufeng Brand L-Threonine of Feed Grade 98.5%, Hebang Brand 88% Methionine Liquid and so on.