Changes in headspace gas composition after treatment and during chilled storage of control and treated poultry sausages are shown in Fig. 2. The gas mixture utilized for modified atmosphere packaging (MAP) contained 50% carbon dioxide and 50% nitrogen and was hence oxygen-free. Consequently, the O2 concentration measured three days after MAP in samples packaged under modified atmosphere, was very low (below 0.5%) but similar as well, whether samples had been treated by high pressure or not.