The effects of dietary treatments on meat quality were shown in Table 3. The highest MDA value of meat samples wasobserved in negative control, followed by positive control. The MDA concentration in meat samples quadratically decreasedin peppermint groups (P < 0.001). Water holding capacity and pH of meat samples were not affected by treatments (P > 0.05),whereas the rate of cooking loss and drip loss decreased in peppermint groups compared to positive control (P < 0.001).