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Optimum sulfur amino acid to lysine ratio for weaner pigs infected with enterotoxigenic E.coli

Monday, March 17, 2014: 3:15 PM
312-313 (Community Choice Credit Union Convention Center)
Meeka M Capozzalo , Murdoch University, Western Australia, Australia
Jan-Willem Resink , Nutreco Research & Development, Boxmeer, Netherlands
John K. Htoo , Evonik Industries AG, Hanau-Wolfgang, Germany
Jae-Cheol Kim , Department of Agriculture and Food, Western Australia, Australia
Cornelis F.M. de Lange , Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada
Christian F Hansen , Department of Large Animal Sciences, University of Copenhagen, Copenhagen, Denmark
Bruce Mullan , Department of Agriculture and Food, Western Australia, Australia
John Pluske , Murdoch University, Western Australia, Australia
Abstract Text:

This experiment tested the hypothesis that pigs challenged with an enterotoxigenic strain of E. coli (ETEC) have higher requirements for sulfur amino acids (SAA). Pigs (n=120) weighing 7.4±0.05 kg (mean±SE) weaned at 27 d (Top-PIE genotype, mixed sex) were stratified into one of 6 treatments (n=20). Five diets were formulated with increasing ratios of standardized ileal digestible (SID) SAA:Lys (analyzed levels 0.47, 0.55, 0.61, 0.68 and 0.76). Pigs were housed in pens of 4 during an adaptation period of 6 d after which time pigs were housed individually. Pigs fed different SAA:Lys levels were infected with ETEC (5 mL, 1.13 x 108 CFU/mL, serotype O149:K91:K88) on d 8, 9, and 10 after weaning. One group of pigs fed the diet containing 0.55 SAA:Lys, which is indicative of current NRC (2012) recommendations, was not infected. Pigs were fed Phase 1 diets (10.2 MJ NE, 1.2% SID Lys) ad libitum until d 15 after weaning. Phase 2 diets (10.2 MJ NE, 1.1% SID Lys) were fed ad libitum for the following 3 weeks. Diets did not contain any antimicrobials. Data were analyzed using GLM procedures (SPSS v. 20) with BW at d 6 included as a covariate. Data for uninfected pigs were combined with infected pigs fed the same level of SAA:Lys, as both groups succumbed equally to edema disease. Average daily gain (ADG) was lower in pigs fed 0.47 SAA:Lys than pigs fed higher ratios for d 7-15 (P = 0.028). Pigs fed 0.47 SAA:Lys had lower ADG during d 30-36 than pigs fed SAA:Lys greater than 0.61 (P = 0.033). Positive linear effects were found for ADG during d 30-36 (P = 0.009) and d 7-36 (P = 0.011), and a quadratic effect was found for ADG during d 7-15 (P = 0.012) and d 7-36 (P = 0.008). There were no differences (P > 0.05) in feed intake. Feed efficiency (FE) was poorer in pigs fed 0.47 SAA:Lys than pigs fed higher ratios for d 7-15 (P < 0.007) and d 7-36 (P < 0.001). The FE improved with increasing SAA:Lys both linearly and quadratically for d 7-15 (P < 0.05) and d 7-36 (P < 0.005). These results suggest that for optimum production in disease-challenged pigs after weaning, the SID SAA:Lys requirement is likely to be above the current NRC (2012) recommendation of 0.55.

Keywords: pig, weaner, sulfur amino acid, E.coli

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