This study was conducted to investigate the effect of flaxseed on some biochemical characteristics represented by ALT, AST ALP, enzymes, as well as to determine glutathione and malondialdehyde levels and body weight of birds which ranged between (175-200)g, (60-70) days old. Male Quail birds were divided into five groups 5 birds-group. Flaxseeds were used after grinding in different concentrations as capsules of (250, 500, 1000, 2000) mg/kg of body weight. The birds were treated daily with that flaxseeds powder. Results showed a good improvement in the biochemical qualities as well as a rise in the level of glutathione and the reduction of MDA level in addition to lowering the body weights of birds, especially in the group given 2000 mg/kg of body weight.