| abstract |
The invention relates to feedstuff additives, containing at least one diketopiperazine having the following general formula (IV), or a salt thereof, where R 1 and R 2 independently of each other are an amino acid residue R (preferably in the L configuration), selected from the group consisting of methionine (R = - (CH 2 ) 2 SCH 3 ), lysine (R = -(CH 2 ) 4 NH 2 ), threonine (R = -CH (OH) (CH 3 )), tryptophan (R = -indolyl), histidine (R = -imidazoyl), valine (R = -CH(CH 3 ) 2 ), leucine (R = -CH 2 CH ( (CH 3 ) 2 ), isoleucine (R = -CH (CH 3 ) CH 2 CH 3 ), phenylalanine (R = -CH 2 Ph), arginine (R = - (CH 2 ) 3 NHC (=NH) CH 2 ), cysteine (R = -CH 2 SH), wherein optionally R 1 can be equal to R 2 ; or containing at least one compound having the following general formula (V), or a salt thereof, where R 1 and R 2 are as defined above; and to the diketopiperazine itself and to a method for producing same. |