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This study was to investigate the effect of dietary supplementation with xylanase and probiotic on growth performance, and gut health of nursery pigs challenged with ETEC. Sixty-four weaned pigs (7.9 ± 0.4 kg) were allotted in a RCBD (2 x 2 factorial). ETEC (0, and ETEC, 6 x 109 CFU/mL) and synbiotic (0, and xylanase 10,000 XU/kg combined with Bacillus sp. 6 x 108 CFU/ kg) were the factors. ETEC was orally inoculated on d 7. Growth performance were measured on d 7, 10, 15, and 21. On d 21, 48 pigs were euthanized for sampling to measure gut health parameters. Synbiotic increased (P < 0.05) ADG in P1 (53.5 to 96.0 g). Overall, ETEC reduced (P < 0.05) ADG (387.5 to 322.5 g) and G:F (0.810 to 0.706). ETEC increased (P < 0.05) fecal score from d 7 to 13, whereas synbiotic reduced (P < 0.05) it at d 9 and 11 in challenged pigs. ETEC increased (P < 0.05) MDA (0.259 to 0.818 μmol/mg), IL6 (2.96 to 4.30 pg/mg), ki-67+ (29.1 to 33.9%), and crypt depth (260 to 290 μm), whereas synbiotic tended to reduce TNF-α (1.05 to 0.87 pg/mg), protein carbonyl (3.13 to 2.51 nmol/mg), and IL6 (4.07 to 3.19 pg/ mg); reduced (P < 0.05) crypt depth (290 to 260 μm), and ki-67+ (32.7 to 30.3%) and increased (P < 0.05) villus height (368.5 to 421.4 μm). ETEC reduced (P < 0.05) abundance of Veillonellaceae (7.11 to 3.02%), tended to reduce (P = 0.067) Clostridiaceae (1.1 to 0.55%), and Prevotellaceae (38.0 to 27.2%) and tended (P = 0.063) to increase Helicobacteraceae (34.5 to 49.5%). Collectively, ETEC reduced growth performance by affecting the microbiome, oxidative stress, and immune response. Synbiotic improve growth performance by enhancing gut health regardless of the challenge, whereas it reduced fecal score in challenged pigs.

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175 Effects of dietary supplementation with xylanase and probiotics on growth performance and gut health of newly weaned pigs challenged with enterotoxigenic E. coli on d 7 post weaned