No interactions were observed between the treatments and storage periods (P N 0.05). The vacuum, 75% O2 + 25% CO2 and 100% CO2 treatments resulted in mean L* values of 36.95 ± 1.05, 38.47 ± 1.05 and 36.32 ± 1.05, respectively. The a* values significantly varied (P b 0.05) among treatments, and less redness was noted in the 100% CO2 treatment (13.01 ± 0.54) than in the other two treatments. The overall mean a* values for the vacuum and 75% O2 + 25% CO2 treatments were 15.35 ± 0.54 and 16.47 ± 0.54, respectively, suggesting probable superficial discoloration (Jeremiah, 2001). There was also a significant variation in b* (P N 0.05) among treatments. Yellowness was greater in the 75% O2 + 25% CO2 group (14.36 ± 0.58) than in the other groups; the overall means in the b* values for the vacuum and the 100% CO2 treatments were 12.43 ± 0.58 and 10.95 ± 0.58, respectively. The high degree of yellowness in the 75% O2 + 25% CO2 group was likely due to the high O2 content and consequently higher oxymyoglobin content in this treatment. Unlike the results obtained in the present study,