3.4.1. Carbon monoxide headspace
The initial concentration of CO in the head space ranged from approximately 0.26% to 0.37% on day 1 (Table 4). The CO headspace concentrations were similar among fat concentration on all days, except for day 1 where the 10% fat treatment had lower (P b 0.05) CO than the 20 and 30% fat treatments. Except for 10% fat treatment on day 1, significant decrease (P b 0.09) in CO concentration was detected on day 25 when compared to day 1 for all fat treatments.