Table 5.

Protein size concentration (wt. %) in duodenal digesta and sialic acid concentration (DM basis) in ileal digesta of pigs fed diets containing 0, 750, 1,500, or 3,000 FTU/kg

	FTU1 per kilogram					P-value
Item	0	750	1,500	3,000	SEM1	Linear	Quadratic
Protein size, kDa
>50, wt.%	43.9	46.4	43.2	44.6	3.3 × 106	1.00	0.70
50–20, wt.%	26.6	20.3	20.3	21.7	1.8 × 106	0.48	0.14
20–5, wt.%	22.9	28.4	30.6	27.7	2.0 × 106	0.38	0.30
<5, wt.%	6.6	4.9	6.0	6.0	3.7 × 105	0.93	0.16
Sialic acid concentration, mg/kg (DM)	81.16	69.65	73.27	71.91	10.34	0.34	0.31

¹FTU = phytase units.