Effect of sample preparation on predicting chemical composition and fermentation parameters in Italian ryegrass silages by near infrared spectroscopy

摘要

The objective of this study was to investigate effect of sample preparations on prediction ability of chemical composition and fermentation parameter for Italian ryegrass silages by NIRS.A population of 174 Italian ryegrass silages representing a wide range in chemical parameters were used in this investigation.Samples were scanned at 1nm intervals over the wavelength range 680-2500nm and the optical data recorded as log 1/Reflectance (log l/R) and scanned in oven-dried grinding and fresh ungrinding condition.The optimum calibrations were selected on the basis of minimizing the standard error of cross validation (SECV) and maximizing the correlation coefficient of cross validation (R2Cv).The results of this study show that NIRS predicted the chemical parameters with high degree of accuracy in oven-dried grinding treatment except for moisture contents.Prediction accuracy of the moisture contents was better for fresh ungrinding treatment (SECV 1.37％, R2 =0.96) than for oven-dried grinding treatments (SECV 4.31％, R2 =0.68).