L-Lysine HCl 98.5% Feed Grade, L-Threonine 98.5% Feed Grade, L-Tryptophan Feed Grade manufacturer / supplier in China, offering Poultry Feed Grade Additives of Dl-Methionine 99%, Huaheng/Meihua Brand Feed Grade Additives L-Valine, Good Quality and Competitive Price Meihua/Fufeng/Huaheng Brand L-Valine and so on.