Analyses of each of the four trials separately demonstrated more consistent effects of enzymes at the total tract level
than the ileal level, both for AMEn and TTAR of N, although significant effects on AIDE and AID of N due to XA and PXA
supplementation were present in one and two of the trials, respectively. This pattern may indicate that effects of these
enzymes on nutrient digestibility were not limited to the small intestine, but the magnitude of the digestibility response
increased during caecal digestion. Combined analyses of these four trials increased the statistical power and the ability to
discern some of the main trends, in particular in terms of AID.