NEAR INFRARED REFLECTANCE SPECTROSCOPY (NIRS) FOR PREDICTING FORAGE QUALITY OF PERENNIAL WARM-SEASON GRASSES IN LA PAMPA, ARGENTINA

摘要

The aim of this study was to evaluate the relationship between NIRS and wet chemistry analysis for in vitro dry matter digestibility (IVDMD), crude protein (CP), neutral detergent fibre (NDF) and lignin. An Infra Alyzer 2.5 Plus (Technicon, New York, USA) interphased to a Hewlett Packard 9815A computer was calibrated for IVDMD, CP, NDF and lignin through 6 different wavelengths, all in the near infrared region. A total of 75 samples of standing, dead, above-ground biomass of warm-season grasses (Bothriochloa bladii, Digitaria eriantha ssp eriantha, Eragrostis curvula cvs Don Eduardo and Tanganika and Panicum antidotale) were analyzed. Correlations coefficients obtained during validation were high for IVDMD (R(2) = 0.827; SE = 1.33) and CP (R(2) = 0.918; SE = 0.31); medium for lignin (R(2) = 0.593; SE = 0.71) and low for NDF (R(2) = 0.285; SE = 2.49).