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Condensed tannins in humid tropical fodder crops and their in vitro biological activity: Part 1
Author(s) -
López Juan,
Tejada Irma,
Vásquez Carlos,
Garza Juan de Dios,
Shimada Armando
Publication year - 2004
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.1651
Subject(s) - gliricidia sepium , proanthocyanidin , fodder , leucaena leucocephala , dry matter , tannin , agronomy , condensed tannin , forage , organic matter , chemistry , rumen , botany , biology , horticulture , food science , fermentation , polyphenol , antioxidant , organic chemistry , biochemistry
A descriptive study was conducted in order to determine the tannin profiles of tropical fodder crops. The following types of condensed tannins (CT) were determined (expressed as g kg −1 of dry matter): free (FCT), bound to protein (CTP), bound to fibre (CTF) and total (TCT). High FCT levels were found in Desmodium ovalifolium (228.4), Flemigia macrophylla (181.9), Guazuma ulmyfolia (129.7) and Leucaena leucocephala (129.5). The highest concentrations of CTP were detected in Gliricidia sepium (61.0), F macrophylla (23.3), and G ulmyfolia (21.1). CTF levels were the highest in G ulmyfolia (55.1), F macrophylla (46.7) and G sepium (41.5). Analyzed samples cultivated in vertisol and fluvisol soils showed different contents of tannins. It has been reported that plants with more than 60 g kg −1 FCT are less palatable and digestible than forages with lower concentrations of this chemical class, although there is more protein to bypass the rumen and higher nitrogen retention. Graminaceous plants showed higher concentrations of FCT and TCT concentrations were generally lower than legumes and other forage crops. Copyright © 2004 Society of Chemical Industry