J. Anim Sci.
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J. Anim Sci. 1971. 33:1371-1374.
© 1971 American Society of Animal Science
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Ruminal and Postruminal Carbohydrate Utilization in Steers Fed Processed Sorghum Grain1

J. W. McNeill2, G. D. Potter3 and J. K. Riggs

Texas A&M University, College Station 77843

Abstract

Four yearling Angus steers fitted with permanent abomasal fistulas were used in a 4 x 4 latin square experimental design to measure relative sorghum grain carbohydrate digestion in different segments of the digestive tract, and to study the effects of various methods of grain processing on starch utilization in the rumen and/or postruminal digestive tract. Processing methods studied were: dry-ground, steam-flaked, reconstituted-ground and micronized. The location of maximum starch digestion varied with processing method. Total starch digestibility was significantly improved (P<.05) by steam-flaking and reconstitution relative to other treatments. Also, ruminal starch digestion was significantly (P<.05) greatest in steers fed steam-flaked and reconstituted grain. In steers fed dry-ground and micronized grain, ruminal starch digestion was impaired and postruminal digestion failed to completely compensate for the reduced ruminal starch fermentation. The difference observed in total carbohydrate digestibility was not significant (P>.05).

Footnotes

1 Appreciation is extended to Mr. Tom Simmons and Mr. Chardo Pierce of Lubbock, Texas for procuring the grain and for processing the steam-flaked and micronized grains. Appreciation is also expressed to A. O. Smith Harvestore Products, Inc., Arlington Heights, Illinois, for financial and material support of the work.

2 Present address: Department of Animal Science, West Texas State University, Canyon.

3 Present address: Department of Animal Science, University of Kentucky, Lexington.






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Copyright © 1971 by the American Society of Animal Science.