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Using near-infrared reflectance spectroscopy (NIRS) as a predictor of in vitro true digestibility (IVTD) of Tifton 85 Bermudagrass

Posted on:2013-11-12Degree:M.SType:Thesis
University:Stephen F. Austin State UniversityCandidate:Sczepanik, Katya ZaneFull Text:PDF
GTID:2453390008977069Subject:Animal sciences
Abstract/Summary:
The primary objective of this study was to determine whether near-infrared reflectance spectroscopy (NIRS) could be used to predict in vitro true digestibility (IVTD) of Tifton 85 bermudagrass.;Tifton 85 bermudagrass samples (n=195) were analyzed for moisture, acid detergent fiber (ADF), neutral detergent fiber (NDF), crude protein (CP), and in vitro true digestibility (IVTD). A calibration was created using spectral data and partial least square (PLS) regression.;Regression analysis of the calibration generated R2 values of 0.679, 0.846, 0.721, 0.972, and 0.965 for moisture, ADF, NDF, CP, and IVTD, respectively. The R2 values for validation (set of samples not in calibration set) of the same parameters were 0.411, 0.3723, 0.648, 0.9713, and 0.9389.;Results suggest that NIRS can be used to predict IVTD more effectively than ADF or NDF. Predicted IVTD values can be used to estimate total digestible nutrients (TDN) or energy values for Tifton 85.
Keywords/Search Tags:IVTD, NIRS, Vitro true digestibility, Tifton, Used, Values
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