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Effect of variety and harvesting management on the concentration of tannins and alkaloids in tagasaste (Chamaecytisus palmensis)

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Title Effect of variety and harvesting management on the concentration of tannins and alkaloids in tagasaste (Chamaecytisus palmensis)
 
Creator Assefa, G.
Sonder, Kai
Wink, M.
Kijorad, C.
Steinmuller, N.
Peters, Kurt J.
 
Subject CHAMAECYTISUS PALMENSIS
TANNINS
FEEDS
 
Description The first part of this study evaluated contents of hydrolysable tannins (HT) and condensed tannins (CT) of 65 accessions of tagasaste. In the second part, the effects of harvesting stage and growing season on the contents of HT, CT and alkaloids in different plant parts of the widely grown tagasaste variety ‘MOA’ was studied in a randomized complete block design. Regrowths of tagasaste was harvested in one experiment at 4, 6, 8 and 10 months, separated into growing buds, leaves, barks, branches and stems and in another trial at 6 months regrowth during the main rainy, dry and short rainy seasons. The leaves of different tagasaste accessions contained on average 115 g/kg dry matter (DM) HTin a range of 16–197 and 12.5 abs/g NDFCT in a range of 6.9–35.0 abs/g NDF. The edible fractions
(growing buds and leaves) were higher in HT and CT contents compared to the structural parts (stems and barks). The leaf fraction contained higher HT and CT (177.2 g/kgDM and 20.1 abs/g NDF) and the HT tended to decline with progressing harvesting stages. High concentration of alkaloids was found in the non-edible fractions, with the highest content in the bark (235 mg/kg) and the lowest in the leaf (40 mg/kg DM) fractions. These levels increased in the fractions from the 4th to the 8th month of harvesting stage and then declined at the 10th month. About 90% of the alkaloids found in tagasaste were sparteine. Higher concentration of HT was found in tagasaste leaves, harvested
during the rainy season compared to the dry season. The concentration of CT was low during the main rainy season, while the highest was during the short rainy and dry seasons. Contents of HT and CT were positively correlated (r = 0.25, P
 
Date 2010-04-18T19:30:45Z
2010-04-18T19:30:45Z
2008-07-15
 
Type Journal Article
 
Identifier Assefa, G.; Sonder, K.; Wink M.; Kijora C.; Steinmueller, N.; Peters, K.J. 2008. Effect of variety and harvesting management on the concentration of tannins and alkaloids in tagasaste (Chamaecytisus palmensis). Animal Feed Science and Technology. 144(3-4): 242-256
http://hdl.handle.net/10568/1265
 
Language en
 
Source Animal Feed Science and Technology