| CPC G01N 21/3563 (2013.01) [G01N 1/286 (2013.01); G01N 1/44 (2013.01); G01N 33/02 (2013.01); G01N 2201/127 (2013.01)] | 6 Claims |

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1. A method of developing a near-infrared (NIR)/neutral detergent fiber digestibility (NDFD) calibration model comprising:
converting gas pressure per mass of isolated NDF or whole sample from in vitro gas production of a calibration sample to NDFD using an IVGP/NDFD correlation algorithm,
measuring NIR data from the calibration sample, and
correlating the NIR data from the calibration sample to the NDFD of the calibration sample.
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