Rapid analysis of soluble components in silage by Fourier transform (mid) infrared
analysis
P. Udén
Department of Animal Nutrition & Management, Kungsängen Research Centre, Swedish
University of Agricultural Sciences, S-753 23 Uppsala, Sweden
Introduction
In the mid-infrared (MIR) as asd asd asd asdg asdg asd ladsf asd sdf zxcv asdf asdf asd asdf asdf
asd asd asd fads fasd asd fasd fasd. Laksdjlkajd asjdfj ajsdhajhds adsljhapljsdhf lkjdfalskd
alskdjflakalsdkjf…
As there are dgasfg kj njkjh…..
Materials and Methods
Silage samples (612) with dry matter contents from …………………….
Results and Discussion
The no of wave lengths included (P<0.05) in the calibration equations varied between 10 and 36
(Table 1). …………………..
Table 1 Sample statistics: number of observations, concentrations by reference methods, and
calibration statistics.
Item
NH3-Na
Sample statistics
No.
415
No. >0.1 g/L
213
No. used
105b
Mean
0.4
Max
1.8
Min
0.1
SD
0.3
Calibration statisticsc
No. of WL
10
SDreg
0.13
SD/SDreg
2.44
CV
0.31
LA
BU
VFA
SUC
BUD
EtOH
WSC
714
713
713
7.0
57.1
0.1
7.8
347
298
298
3.6
21.6
0.0
4.7
720
719
719
3.8
35.1
0.0
4.9
672
663
663
2.1
7.9
0.0
1.4
618
585
585
2.4
20.7
0.0
2.6
720
717
717
4.2
18.5
0.0
3.5
371
368
368
16.0
85.8
0.0
16.9
17
1.06
7.29
0.15
12
0.90
5.37
0.22
22
0.67
7.23
0.18
34
0.20
6.93
0.09
36
0.42
6.17
0.17
15
0.56
6.18
0.13
12
3.54
4.78
0.22
a
LA=lactatic acid; BU=butyric acid; VFA=volatile fatty acids; SUC=succinic acid; BUD=2,3
butanediol; EtOH=ethanol; WSC=water soluble carbohydrates. bSamples spiked with NH3 were
excluded. cWL=wavelengths; SDreg=standard deviation from regression; SD=population SD;
CV=coefficient of variation.
Fig. 1 shows the dominant peaks of ammonia, butyrate and ethanol …………………
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Figure 1 Absorbance spectra of Control and Spiked silage juice (BUT=butyric acid;
EtOH=ethanol; LA=lactic acid; WSC=water soluble sugars). Inserted table values are in g/L.
Conclusions
A FTIR instrument for milk analysis was successfully calibrated ………………………….
References
Udén, P., 2009. Estimating residual starch from in vitro fermentations by Fourier transform midIR transmission spectroscopy. Anim. Feed Sci. Technol., 152, 123-132.
Weisbjerg, M.R., Hvelplund, T., Søegaard, K., 2004. Prediction of….
Authors please note: References should be formatted according to the guidelines for Animal
Feed Science and Technology
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