During the trial, 80 male broilers of the Ross 308 strain were allocated to four
dietary groups: control and three groups supplemented with thymol, tannic acid and gallic
acid. Feed utilization was improved in all experimental groups and tannic acid also improved
final body weight. Gallic acid significantly increased n3 long chain polyunsaturated fatty
acids. Hypocholesterolemic effect was noticed in all groups in liver, but not in muscle. The
glucose lowering effect in serum was noticed in tannic group in comparison to other
experimental groups. Oxidative susceptibility was improved by tannic acid in liver and breast
and by gallic acid in breast muscle.