According to the results of the microbiological, physical and chemical evaluations, as well as the sensory acceptance of cooked meat, we conclude that the samples stored in packages containing 100% CO2 for 28 days at 1 °C have greater stability and better shelf life than vacuum-packed samples and those packaged in a 75% O2 + 25% CO2 atmosphere for 21 days. However, the 100% CO2 treatment was the least preferred in terms of the appearance of the raw meat while still packed when compared to the other MAP systems under evaluation. Therefore, despite presenting greater stability, further studies should be performed on the packaging of lamb meat at high concentrations of CO2. Other gases in combination with CO2may enable the maintenance of a more acceptable color of the packaged meat, especially when it is intended for retail sales.