Date of Award

Fall 2011

Project Type


Program or Major

Animal Science

Degree Name

Master of Science

First Advisor

Charles Schwab


Three soybean meal (SBM), 3 SoyPlusRTM (SP), 5 dried distillers' grains with solubles (DDGS), and 5 fishmeal (FM) were obtained from FeedAC, Inc. (Homer, NY) and along with 5 cornsilage hybrid samples (CS), were used in an experiment to calculate total tract digestibility of crude protein (CP) and amino acids (AA). An in vitro procedure was used that incorporated the modified three step procedure (mTSP) developed by Calsamiglia and Stern (1994) and then modified by Gargallo et al. (2006) and the protease incubation procedure developed by McNiven et al. (2001) which replaces the in situ rumen incubation step in the mTSP. In the validation of the procedure correlation coefficients were produced from comparisons of experiments done previously in the same lab with the same feeds (Boucher et al. 2009 a,b&d, Fredin unpublished). Protein feeds had varied but promising results where as the CS sample results were too variable to be used to measure digestibility.