0.05; Table 7), but emissions did not differ between
treatments (g · d
–1
· pig
–1
,
P
= 0.06; g · d
–1
· AU
–1
,
P
= 0.10). The interaction between phase and treatment was not significant for concentration or emissions variables (
P
> 0.05, Table 7). Phase effects were
observed for both concentrations and emissions (
P
<
0.01, Table 7). The emissions (g · d
–1
· AU
–1
) peaked
during Phase 1 and then decreased with advancing pig
age. Similar results were also observed in the study of
Li et al. (2011). The rationale for this might be that a
pig’s digestive capacity gradually increases with maturity, as does stomach volume and gastric secretions
(Manners, 1976).