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RESEARCH ARTICLE

Pigs experimentally infected with an enterotoxigenic strain of Escherichia coli have improved feed efficiency and indicators of inflammation with dietary supplementation of tryptophan and methionine in the immediate post-weaning period

M. M. Capozzalo A G , J. C. Kim A , J. K. Htoo B , C. F. M. de Lange C , B. P. Mullan D , C. F. Hansen E , J. W. Resink F and J. R. Pluske A H
+ Author Affiliations
- Author Affiliations

A School of Veterinary and Life Sciences, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia.

B Evonik Industries AG, Hanau, Germany.

C Department of Animal Biosciences, University of Guelph, Guelph, Ontario, Canada.

D Department of Agriculture and Food Western Australia, South Perth, WA 6151, Australia.

E Department of Large Animal Sciences, University of Copenhagen, Copenhagen, Denmark.

F Nutreco R & D, Boxmeer, The Netherlands.

G Present address: Selko B.V., Jellinghausstraat 24, 5048AZ Tilburg, The Netherlands.

H Corresponding author. Email: J.Pluske@murdoch.edu.au

Animal Production Science 57(5) 935-947 https://doi.org/10.1071/AN15289
Submitted: 7 June 2015  Accepted: 22 February 2016   Published: 21 June 2016

Abstract

This experiment tested the hypothesis that pigs challenged with an enterotoxigenic strain of E. coli (ETEC) will improve performance by dietary supplementation of sulfur amino acids (SAA) and tryptophan (Trp) above the current recommended levels in the immediate post-weaning period. Male pigs (n = 96) weighing 6.2 ± 0.78 kg (mean ± s.d.) and weaned at 21 days were stratified into one of four treatments based on weaning weight (n = 24). Four diets were formulated [11.2 MJ NE/kg; 20.1% crude protein, 1.25% standardised ileal digestible (SID) lysine (Lys)] according to a 2 × 2 factorial arrangement of treatments with two levels of SID SAA : Lys ratio (0.52 vs 0.60) and two levels of SID Trp : Lys ratio (0.16 vs 0.24). Diets did not contain any antimicrobial compounds. Pigs were individually housed and were fed diets for 14 days after weaning. Pigs were infected with ETEC (3.44 × 108 CFU/mL, serotype O149 : K91 : K88) on Days 5, 6, and 7 after weaning. Pigs were bled on Days 5, 8 and 14 and subsequently analysed for plasma levels of acute-phase proteins, urea, cytokines (Days 5 and 8 only) and amino acids (Days 5 and 8 only). Increasing Trp (P = 0.036) and SAA (P = 0.028) improved feed conversion ratio, and combined supplementation of SAA and Trp further improved FCR than individual supplementation of either SAA or Trp (P = 0.092). Dietary treatments had no impact on the incidence of post-weaning diarrhoea (P > 0.05). Increasing SAA increased shedding of ETEC on Days 12 and 14 after weaning (P < 0.019). Increasing dietary Trp reduced the intensity of inflammation (as measured by APP Index = [(C-reactive protein × PigMAP)/apolipoprotein A1]) immediately after infection with ETEC (P < 0.05), while increasing dietary SAA reduced the APP index on 24 h and 7 days after ETEC infection (P < 0.05). Increasing dietary SAA reduced plasma levels of interferon-gamma regardless of dietary Trp or day of sampling (P = 0.043). Increasing dietary SAA decreased plasma urea (PU) levels on Days 5, 8 and 14 (P < 0.05). These data indicate that Trp supplementation reduced the intensity of inflammation and SAA supplementation decreased the pro-inflammatory interferon-gamma response and improved protein utilisation, as measured by PU, whereas supplementation with both Trp and SAA improved feed conversion ratio.

Additional keywords: E. coli, methionine, tryptophan, weaner pigs.


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