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Rapeseed napin and cruciferin are readily digested by poultry.

Authors
  • Kasprzak, M M1
  • Houdijk, J G M2
  • Liddell, S1
  • Davis, K1
  • Olukosi, O A2
  • Kightley, S3
  • White, G A1
  • Wiseman, J1
  • 1 School of Biosciences, University of Nottingham, Loughborough, UK.
  • 2 Monogastric Science Research Centre, Scotland's Rural College, Edinburgh, UK.
  • 3 National Institute of Agricultural Botany, Cambridge, UK.
Type
Published Article
Journal
Journal of animal physiology and animal nutrition
Publication Date
Aug 01, 2017
Volume
101
Issue
4
Pages
658–666
Identifiers
DOI: 10.1111/jpn.12576
PMID: 27562881
Source
Medline
Keywords
License
Unknown

Abstract

Rapeseed proteins have been considered as being poorly digestible in the gut of non-ruminants. The aim of the study was to assess the digestibility of napin and cruciferin in ileal digesta of broiler chickens, testing sixteen samples of rapeseed co-products with protein levels ranging from 293 g/kg to 560 g/kg dry matter. Each sample was included into a semi-synthetic diet at a rate of 500 g/kg and evaluated with broiler chickens in a randomised design. Dietary and ileal digesta proteins were extracted and identified by gel-based liquid chromatography-tandem mass spectrometry (LC-MS/MS). Three isomers of napin (a 2S albumin) and nine cruciferins (an 11S globulin) were identified in the rapeseed co-products, whereas six endogenous enzymes such as trypsin (I-P1, II-P29), chymotrypsin (elastase and precursor), carboxypeptidase B and α-amylase were found in the ileal digesta. It is concluded that as none of the rapeseed proteins were detected in the ileal digesta, rapeseed proteins can be readily digested by broiler chickens, irrespective of the protein content in the diet.

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