ORIGINAL PAPER
Prediction of the nutritive value of wet whole-crop sorghum silage according to the INRA feeding system by near-infrared spectroscopy
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University of Agriculture in Krakow, Department of Animal Nutrition and Feed Management, al. Mickiewicza 24/28, 30-059 Krakow, Poland
Publication date: 2013-09-09
Corresponding author
J. Kański
University of Agriculture in Krakow, Department of Animal Nutrition and Feed Management, al. Mickiewicza 24/28, 30-059 Krakow, Poland
J. Anim. Feed Sci. 2013;22(4):360-365
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ABSTRACT
The aim of the study was to determine the usefulness of near-infrared
spectroscopy (NIRS) for direct estimation of energy, protein and fillunits
as well as organic matter digestibility (OMD) for wet whole-crop sorghum
silages according to the French feeding system for ruminants INRA (1988).
Fifty-eight whole-crop sorghum silages ensiled alone or with the addition of
wheat bran, rapeseed meal, or whole-crop maize were used to create a calibration
data set. Wet samples of silage were scanned using a spectrophotometer
(570–1850 nm). The spectral data were transformed to the first derivative. For
scatter correction, standard normal variate and detrending methods were used.
The calibration equations were developed using modified partial least squares
regression.The accuracy of each equation was evaluated based on the coefficient
of determination of calibration (R2), standard error of calibration, and
standard error of cross validation (SECV). High R2 (> 0.93) were shown for all
parameters except OMD (R2 = 0.83).The highest SECV (0.62) was observed
for protein units, but all errors were within acceptable values. The results of the
study suggest that NIRS may be used for direct prediction of nutritive value of
sorghum silages in INRA system units. Furthermore, these results suggest that
the NIRS technique may be successfully used for direct estimation of feed units
for ruminants in wet silages.
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