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Publication type: Journal Article
Document type: Full Paper

Year: 2003

Author(s): Seresinhe, T; Iben, C

Title: In vitro quality assessment of two tropical shrub legumes in relation to their extractable tannins contents.

Source: J Anim Physiol Anim Nutr (Berl) (87), 3-4 109-115.

Authors Vetmeduni Vienna:

Iben Christine

Vetmed Research Units
Institute of Animal Nutrition and Functional Plant Compounds

The in vitro dry matter digestibility (IVDMD) of the two leguminous tree fodders Gliricidia sepium and Calliandra calothyrsus which differ in their tannin content was examined by the rumen simulation technique. Extractable condensed tannin (CT) concentrations ranged from 0.57% in G. sepium to 5.05% in C. calothyrsus using the butanol-HCl extraction. On the basis of their respective CT contents, G. sepium was classified as containing traces of CT, whereas C. calothyrsus had medium amounts of CT. Polyethylene glycol (PEG) was added at different concentrations (0, 1.5, 5 and 10 g/100 g plant material substrate) to assess the effect of tannins on IVDMD. The IVDMD was higher for G. sepium (range: 60-65%) than for C. calothyrsus (39.5-53.5%). In vitro gas production and IVDMD increased with increased PEG concentrations especially for C. calothyrsus. A non-significant response to increasing PEG concentrations for IVDMD of G. sepium confirms PEG binding with the tannins. On the basis of these results, it is assumed that G. sepium has a higher nutritive value than C. calothyrsus. Good relationship between PEG binding and the improvement of IVDMD confirms the usefulness of this technique for improving the nutritive value of tanniniferous tropical browses.

Keywords Pubmed: Animal Feed
Dose-Response Relationship, Drug
Nutritive Value
Polyethylene Glycols/chemistry
Polyethylene Glycols/pharmacology
Quality Control

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