Effect of poly ethylene glycol addition on Nutritive Value and Gas production parameters of four browsing Trees.
Effect of poly ethylene glycol addition on Nutritive Value and Gas production parameters of four browsing Trees.
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Date
2015-04-08
Authors
Abdullah, Ahmed
Journal Title
Journal ISSN
Volume Title
Publisher
UOFK
Abstract
Nutritive value of four browsing trees (Acacia.torrtlis , Ziziphus.spinachristi
, Acacia.mellifera and Acacia.seyal ) leaves and pods were
evaluated by estimating chemical composition and in vitro gas
production techniques.The chemical composition for both leaves and
pods were significantly different (p<0.01 ) among the species . Crude
protein (CP) contents ranged from 16.0 to 24.1 %. Acid detergent
fibre (ADF) and neutral detergent fibre (NDF) contents varied
within species in the range 18.5- 43.8 % and 36.1 - 72.3% respectively
. Total condensed tannin (TCT) contents ranged from 0.5- 6.2%. TCT
were negatively correlated with fraction (b) and (a +b) whereas ADF
were negatively correlated with most of the estimated parameters .
The gas production parameters significantly varied among the
species . There were also significant differences in terms of
cumulative gas production , invitro organic matter digestibility
(IOMD) and calculated metabolizable energy (ME). The addition of
poly Ethylene Glycol (PEG) significantly increased (p<0.01 ) the gas
production from both soluble and insoluble fraction (a) and (b) ,
invitro organic matter digestibility (IOMD) and metabolizable energy
(ME) . The IOMD values of leaves and pods without PEG ranged from
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39.7to 64.5 % and with PEG ranged from 37.9 to 80.0 %. While the ME
content without PEG ranged from 5.9 to 10.6 MJ kg/DM and the ME
content with PEG ranged from 5.7 to 13 MJ kg/DM The best
improvement in gas production, invitro organic matter digestibility
(IVOMD) and metabolizable energy (ME) were observed with 50% PEG
w/w. Generally this improvement indicate the negative effect of tannins on
digestibility.