Simplified in situ method for estimating ruminal dry matter and protein degradability of concentrates1

TL;DRAbstract

In this study, dry matter and crude protein in situ degradation data from different concentrate feeds were used to test the accuracy of effective degradability (ED) measures when using reduced ruminal incubation times compared with models based on seven or eight incubation times. The ED was estimated both with and without correction for nylon bag particle loss. The crude protein ED corrected for particle loss of the calibration data set was widely distributed in a range from 16 to 90% with an overall mean value of 60.4%, and the dry matter ED was distributed in the range from 22.7 to 80.7%, with a mean value of 56.9%. The simplified method was developed based on bilinear regression models where all combinations of one to three disappearance values were tested to find the optimal time point combinations to estimate ED. Bilinear regression models based on two and three ruminal incubation times gave similar estimates to a standard in situ method over a wide range of passage rates both for

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