Figure 3.

Intracage ammonia levels (mean ± SEM) associated with 4 bedding types over time as measured by using (A) reagent tubes, (B) colorimetric strips, and (C) a photoionization detector (n = 20 measurements per group per time point). Significant (*, P < 0.05; †, P < 0.01; ‡, P < 0.001) differences between beddings (green, aspen and corncob; black, aspen and pelleted cellulose; purple, aspen and diced cellulose; pink, corncob and pelleted cellulose; red, corncob and diced cellulose; and brown, pelleted and diced cellulose) are indicated.