Xylanase and xylo- oligosaccharide prebiotic improve the growth performance and concentration of potentially prebiotic oligosaccharides in the ileum of broiler chickens

AC Craig, FM Khattak, P Hastie, Michael R Bedford, OA Olukosi*

*Corresponding author for this work

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Abstract

1. The objective of this study was to investigate the effect of supplementing diets deficient in energy and protein with xylanase or xylo- oligosaccharide (XOS), on growth performance, the flow of non-starch polysaccharide (NSP) hydrolysis products in the ileum and concentration of short chain fatty acids (SCFA) in the caeca of broiler chickens.
2. Five hundred male Ross 308 broilers were used in this 29 day study. The treatments were organised into a 2 × 2 plus 1 factorial arrangement consisting of two additives (xylanase or XOS) at two levels (low or high) plus a control treatment with no additives.
3. Birds and feed were weighed on days 0, 14 and 28. On days 14 and 28 two birds per pen were euthanized by overdose of barbiturate, the caeca were removed and the contents collected and analysed for short chain fatty acid (SCFA) concentration. On day 29, six birds per pen were euthanized and ileal digesta were collected and analysed for the concentration of NSP fractions.
4. On day 14, caecal acetic acid, iso-butyirc acid, iso-valeric acid, n-valeric acid and total SCFA concentrations were significantly greater (P ≤ 0.05) when diets were supplemented with XOS compared with xylanase. There were additive type × inclusion level interactions for water unextractable (WU) and water extractable (WE) NSP. Arabinose, galactose and glucuronic acid (GlucA2) were significantly greater (P ≤ 0.05) in the WU NSP fraction when diets were supplemented with a high level of xylanase compared with the control treatment.
5. Ileal flow of fructose was significantly greater (P ≤ 0.05) in the WE NSP when a high level of xylanase or low level of XOS was included in the diet compared with the control. WE Galactose and GlucA2 were significantly greater (P ≤ 0.05) when xylanase or XOS were included in the diet compared to the control.
6. It was concluded from this study that the improvements in growth performance were partly driven by an increase in intestinal in-situ prebiotic oligosaccharides or SCFA generated by the use of xylanase. This observation demonstrates a further benefit of xylanase supplementation of wheat-based broiler diets beyond digesta viscosity reduction and the release of extra nutrients.
Original languageEnglish
Pages (from-to)70-78
Number of pages9
JournalBritish Poultry Science
Volume61
Issue number1
Early online date4 Oct 2019
DOIs
Publication statusPrint publication - Feb 2020

Keywords

  • Broilers
  • SCFA
  • XOS
  • nutrient digestibility
  • performance
  • xylanase

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