FEED ADDITIVE AND ITS PRODUCTION

The invention relates to fodder additives comprising a compound inducing the microsomal enzyme system of the liver, such as a compound of the formula (I)whereinRi, R2 and R3 which may be the same or different represent hydrogen, halogen, trihalomethyl, or alkyl or alkoxy group each containing from 1 to 6 carbon atoms;R4 is phenyl, dialkylaminocarbonyl or alkoxycarbonyl having from 1 to 6 carbon atoms in the alkyl and alkoxy moieties, respectively;R5 is hydrogen or methyl, or together with R4 and the nitrogen atom to which they are attached forms a heterocyclic ring having up to 8 members;n is an integer 1, 2, 3, 4 or 5;m is 0 or 1;a is 0 or 1,with the proviso that if a = 0, R1 is trihalomethyl and R2 and R3 both are hydrogen. The compounds are preferably used in amount of 0.5 to 99% by weight, in admixture with a conventional carrier and/or additive and optionally at least one further active ingredient conventionally used in the animal husbandry.The enzyme-inducing compounds used according to the invention accelerate the elimination of various xenobiotics metabolizing in the iiver.