“…It has been demonstrated that inclusion of feed ingredients containing tannins resulted in undesirable physiological and biochemical effects (Armstrong et al, 1974;Smulikowska et al, 2001) including growth inhibition, negative nitrogen balances, reduced intestinal absorption of sugars and amino acids, reduced immune response, and increased protein catabolism (Santidrian, 1981;Santidrian and Marzo, 1989;Marzo et al, 2002). However, with better understanding of the chemical composition and biological activity of tannins (Mueller-Harvey, 2006), tannin is now known to play a beneficial antioxidant role, preventing lipid peroxidation (Laughton et al, 1991;Morel et al, 1993;Caraceni et al, 1997;Lopes et al, 1999;Rajalakshmi et al, 2001;Glahn et al, 2002) reported that at 0.5% inclusion rate, chestnut tannins had positive effects on carcass characteristics, meat quality, lipid oxidation and fatty acid composition in rabbits.…”