soybean meal, corn cluten meal, corn stalks, rumen fermentation, ammonia, volatile fatty acids
A study was conducted using four ruminally fistulated wethers to compare ruminal fermentation characteristics of corn gluten meal (high escape) and soybean meal (low escape) supplements to corn stalks. Supplements were fed at 24 or 48-hour intervals. Ruminal ammonia nitrogen (RNH3-N) concentrations were affected (P<.05) by treatment and treatment by hour interactions occurred. Soybean meal fed at 48- hour intervals (SBM48) resulted in the highest mean and peak RNH3-N concentrations, as expected due to the quantity of rumen degradable protein fed. Soybean meal fed at 24-hour intervals (SBM24) caused higher (P<.05) RNH3-N concentration than corn gluten meal fed at 24-hour intervals (CGM24) but not CGM48. Total VFA concentrations averaged over time were not affected (P> .I0) by type of protein supplement. Treatment by hour interactions were observed (Pc.05) for total VFA, because SBM24 resulted in higher VFA concentrations at several points in the 48-hour sampling period. The ratios of acetate:propionate: butyrate were similar, 74:18:7, 74:18:7, 74:18:8 and 74:18:8 for SBM24, SBM48, CGM24 and CGM48, respectively. Ruminal fluid pH values were within the range of 6.2 to 7.0 normally associated with predominantly roughage diets. Alternate day supplementation with CGM48 allows for adequate ruminal fermentation and a more constant RNH3-N concentration than SBM48.
Number of Pages
South Dakota State University
Copyright © 1989 South Dakota State University
Collins, R. M. and Pritchard, R. H., "Alternate Day Supplementation of High Escape Compared to Low Escape Protein Fed with Corn Stalks" (1989). South Dakota Beef Report, 1989. 8.