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In vitro protein digestion kinetics of protein sources for pigs

Published online by Cambridge University Press:  29 October 2018

H. Chen Open the ORCID record for H. Chen [Opens in a new window] ,
P. A. Wierenga ,
W. H. Hendriks  and
A. J. M. Jansman
H. Chen*
Affiliation:
Animal Nutrition Group, Wageningen University, De Elst 1, 6708WD, Wageningen, The Netherlands Wageningen Livestock Research, De Elst 1, 6708WD, Wageningen, The Netherlands
P. A. Wierenga
Affiliation:
Laboratory of Food Chemistry, Wageningen University, Bornse Weilanden 9, 6708WG, Wageningen, The Netherlands
W. H. Hendriks
Affiliation:
Animal Nutrition Group, Wageningen University, De Elst 1, 6708WD, Wageningen, The Netherlands
A. J. M. Jansman
Affiliation:
Wageningen Livestock Research, De Elst 1, 6708WD, Wageningen, The Netherlands
*
†E-mail: [email protected]
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Abstract

In current feed evaluation systems, the nutritional value of protein sources in diets for pigs is based on the ileal digestibility of protein and amino acids, which does not account for the kinetics of protein digestion along the gastrointestinal tract. The objective of the present study was to determine the in vitro protein digestion kinetics of different protein sources (soya bean meal (SBM), wheat gluten (WG), rapeseed meal (RSM), whey powder (WP), dried porcine plasma protein, yellow meal worm larvae and black soldier fly larvae (BSF)). Protein sources were incubated with pepsin at pH 3.5 for 0 to 90 min and subsequently with pancreatin at pH 6.8 for 0 to 210 min at 39°C. The in vitro protein digestion kinetics were described as the kinetics of nitrogen (N) solubilisation and the release of low molecular weight peptides (LMW) (<500 Da). The N solubilisation rate ranged from 0.025 min−1 for BSF to 0.685 min−1 for WP during the incubation with pepsin, and from 0.027 min−1 for RSM to 0.343 min−1 for WP during the incubation with pancreatin. The release rate of LMW peptides ranged from 0.027 min−1 for WG to 0.093 min−1 for WP during the incubation with pepsin, and from 0.029 min−1 for SBM to 0.385 min−1 for WP. Black soldier fly larvae showed a similar release rate of LMW peptides as WP during the incubation with pancreatin. At the end of the sequential incubation with pepsin (90 min) and pancreatin (210 min), WG and WP showed the highest percentage of N present in LMW peptides relative to total N (78% and 79%, respectively), whereas SBM showed the lowest (35%). In conclusion, protein sources for pig diets show substantial differences in in vitro protein digestion kinetics as measured by the kinetics of N solubilisation and the release of LMW peptides. The rate of release of LMW peptides was not correlated to the rate of N solubilisation for each of the protein sources evaluated.

Keywords

plant protein sourcesporcine plasmayellow meal wormblack soldier fly larvaegastrointestinal protein degradation
Type
Research Article
Information
animal , Volume 13 , Issue 6 , June 2019 , pp. 1154 - 1164
Copyright
© The Animal Consortium 2018 

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