study. The basal endogenous N and AA losses in the
current study were similar to those reported by Dilger
et al. (2004) and Opapeju et al. (2006), who also fed a
casein-corn starch diet (5% casein) to growing and finishing
pigs, respectively. The SID of Pro in both canola
meals was greater than 100%. Dilger et al. (2004) and
Opapeju et al. (2006) similarly observed SID values of
Pro that were greater than 100%. Dilger et al. (2004)
attributed this greater SID of Pro to increased basal
endogenous loss of the same AA when pigs were fed
low-protein diets; thus, the SID values of Pro might be
greater than the true digestibility values.