Functional interactions of manno-oligosaccharides with dietary threonine in chicken gastrointestinal tract: I. Growth performance and mucin dynamics

Title
Functional interactions of manno-oligosaccharides with dietary threonine in chicken gastrointestinal tract: I. Growth performance and mucin dynamics
Publication Date
2010
Author(s)
Chee, Seng Huan
Iji, Paul
Choct, Mingan
( author )
OrcID: https://orcid.org/0000-0002-2242-8222
Email: mchoct@une.edu.au
UNE Id une-id:mchoct
Mikkelsen, Lene Lind
Kocher, Andreas
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Taylor & Francis
Place of publication
United Kingdom
DOI
10.1080/00071668.2010.517251
UNE publication id
une:7391
Abstract
1. An experiment was conducted to evaluate the interactive effects of manno-oligosaccharides (MOS; Bio-MOS®) and dietary threonine on the growth performance in relation to intestinal mucin dynamics in broiler chickens from 1 to 21 and from 22 to 35 d of age. Two concentrations of MOS (0 or 2 g/kg for d 1 to 21; and 0 or 1 g/kg for d 22 to 35) and three concentrations of threonine (0·0, 1·0 and 1·2 of National Research Council (NRC), 1994, recommendations) were included in the experimental diets for each age group. 2. Body weight gain was significantly lower in threonine-deficient birds compared with those fed on adequate or excess threonine diets. Positive interaction between MOS and threonine supplementation on body weight gain was apparent in all phases of growth due mainly to the significantly poorer performance of birds given excess threonine in the absence of MOS. 3. The duodenal and ileal adherent mucous thickness were reduced at 14 and 28 d in threonine-deficient birds. Nevertheless, MOS significantly increase duodenal adherent mucous thickness at 14 d and ileal mucous thickness at 14 and 28 d. At 14 d, a significant MOS and threonine interaction on the jejunal adherent mucous thickness was also noted in that there was no difference between adequate and excess threonine groups in the absence of MOS, but a significant increase with excess threonine and MOS supplementation. 4. Dietary threonine greatly influenced mucin synthesis at the translational stage with no effect on jejunal MUC2 gene expression. Conversely, MOS modulated the transcriptional stage of intestinal mucin synthesis by consistently up-regulating jejunal MUC2 gene expression which was independent of dietary threonine concentration. There were no significant interactions between threonine and MOS on all the goblet cell densities. However, there was a MOS and threonine interaction on the staining intensities of jejunal sulphomucins due mainly to the significantly lower staining intensities in birds fed excess threonine in the absence of MOS. 5. The ameliorative effect of MOS on the growth-suppressive effects of excess threonine is likely to be linked to its modulating effects on the intestinal mucin dynamics.
Link
Citation
British Poultry Science, 51(5), p. 658-666
ISSN
1466-1799
0007-1668
Start page
658
End page
666

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