Bioactive Whey Protein Concentrate and Lactose Stimulate Gut Function in Formula-Fed Preterm Pigs.

Objective: Formula feeding is associated with compromised intestinal health in preterm neonates compared with maternal milk, but the mechanisms behind this are unclear. We hypothesized that the use of maltodextrin and whey protein concentrates (WPCs) with reduced bioactivity due to thermal-processing are important factors. Method: Ninety-two caesarean-delivered preterm pigs were fed increasing doses of formulas for 5 days (24-120 mL/kg/d). In Experiment 1, four groups of pigs (n = 15-16) were fed lactose- or maltodextrin-dominant formulas (lactose/maltodextrin ratios 3:1 or 1:3, respectively), containing WPC with either high or low levels of IgG (WPC1 or WPC2, respectively). In Experiment 2, two groups of pigs (n = 15-16) were fed lactose-dominant formulas with either a bioactive WPC (BioWPC, produced by reduced thermal-processing) or a conventional WPC (ConWPC). Results: In Experiment 1, pigs fed formula with WPC1 had higher villi, hexose absorption, and lactase activity in small intestine, relative to WPC2, but predominantly with the lactose-dominant formula (all P

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