Near infrared reflectance spectra of fibrous constituents in forages and rice straw
1991
Amari, M. (National Inst. of Animal Industry, Kukizaki, Ibaraki (Japan)) | Abe, A. | Kawano, S. | Cho, R.K.
The absorption characteristics of near infrared reflectance spectra were examined to determine fibrous constituents present in Italian ryegrass, alfalfa, corn silage and rice straw. Fibrous constituents used in this study were crude fiber (CF), acid detergent fiber (ADF), cell wall (CW) and residue digested CW by cellulose (organic b fraction, Ob) isolated from forage and rice straw. Cellulose, xylan, alkaline lignin and sulfonate lignin were used as standard materials. The standard materials and fibrous constituents were measured in a wavelength region from 1,100 to 2,500nm by near infrared reflectance spectroscopy. Absorption bands of the fibrous constituents for related substance such as cellulose, xylan and lignin were examined. The spectrum of each fibrous constituent showed major absorbance bands of strong intensity at 1,365, 1,425, 1,481, 1,589, 1,701, 2,105, 2,269, 2,337 and 2,393nm corresponding to the absorption of cellulose and major absorbance bands of strong intensity at 1,369, 1,429, 1,697, 1,721, 20,69, 2,253, 2,281, 2,321 and 2,357nm corresponding to absorption of xylan. It was found that each fibrous constituent had peculiar absorption bands which might be useful in constructing a independent calibration to determine CF, ADF, CW or Ob in forages and rice straw
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