Feed grade amino acid
L-Lysine
Glycine
L-theronine
DL-methionine
L-Tryptophan

Amino acids are the basic material needed to constitute animal nutrition protein. Animals of the amino acids are L-shaped, so the animal feed L-amino acids can be a good use of some synthetic amino acids are D-type microorganisms also have D-type, for D-amino acids some animals can make good use of some relatively poor utilization. Methionine, cystine, glutamic acid, leucine, phenylalanine, proline and tyrosine either L or D-type, can be a good use of the animal, so now synthetic, added to feed is DL-methionine, and L-lysine.
Amino acids in animal nutrition important role are:
(1) material is a synthetic protein.
(2) to participate in a variety of important physiological activities.
(3) to provide energy.
(4) is necessary for animal production.