| abstract |
Feed additives containing essential amino acids which are diketopiperazines of formulas (IV) or (V) or salts thereof are provided: n n n n n n n n n n In formulas (IV) and (V), R 1 and R 2 may be an amino acid residue such as methionine, lysine, threonine, tryptophan, histidine, valine, leucine, isoleucine, phenylalanine, arginine, and cysteine, and may optionally be the same residue. n n n n n n n n n n Additionally provided are the diketopiperazines of formulas (IV) and (V) and a method to for their production. |