SHORT COMMUNICATION
Rate of NDF degradation
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1
Faculty of Agricultural Sciences, University of Aarhus, Research Centre Foulum,
P.O. Box 50, DK-8830 Tjele, Denmark
2
Institute of Animal Science,
Přátelství 815, 104 00 Praha-Uhříněves, Czech Republic
Publication date: 2007-09-17
Corresponding author
M. R. Weisbjerg
Faculty of Agricultural Sciences, University of Aarhus, Research Centre Foulum,
P.O. Box 50, DK-8830 Tjele, Denmark
J. Anim. Feed Sci. 2007;16(Suppl. 2):151-155
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ABSTRACT
Degradation profiles for NDF were estimated for 83 samples of grass/grass-clover, 27 samples of
cereal whole crop and 14 samples of maize whole crop. To examine variation in rate of degradation,
degradation profiles were analysed for rate of degradation in individual incubation intervals. For
grass/grass-clover and maize whole crop, rate of degradation first increased and then decreased
with increasing incubation time, especially for grass/grass-clover, indicating both a lag time before
maximum degradation is reached, and multiple NDF pools with different rates of degradation. In
contrast, whole crop cereals had a very high degradation rate in the first incubation interval, and
thereafter degradation rate decreased, indicating that a small fraction of the NDF in whole crop
cereals is very easily degradable. The non constant rate of NDF degradation means that estimated
degradation parameters will be very dependent on the degradation times used for parameterization,
and therefore standardization of the method used for estimation of degradation characteristics is
essential.
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