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Journal of Dairy Science Vol. 50 No. 10 1638-1644
© 1967 by American Dairy Science Association ®
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Effect of Soybean Meal, Raw Soybeans, Corn Gluten Feed, and Urea on the Concentration of Rumen Fluid Components at Intervals after Feeding1

G. V. Davis and O. T. Stallcup

Department of Animal Sciences, University of Arkansas, Fayetteville

ABSTRACT

Trials utilizing three fistulated steers, in two Latin-square designed experiments, were conducted with five rations equal in digestible protein and containing cottonseed hulls, plus one of the following protein supplements: soybean meal, raw soybeans, corn gluten feed, urea, or urea + soybean meal.

In the first experiment, soybean meal, raw soybeans, and corn gluten feed were fed. The corn gluten feed ration was associated with the highest concentrations of total nitrogen (N) and protein N in the rumen fluid; the ration of raw soybeans was associated with the lowest concentrations; and the soybean meal ration with intermediate concentrations. Concentrations of ammonia-N were highest with soybean meal and the lowest with raw soybeans. Total volatile fatty acids (VFA) were similar for soybean meal and corn gluten feed.

Soybean meal, urea, and urea + soybean meal were fed in the second experiment. The soybean meal ration was associated with the highest concentrations of total N and protein N; the urea ration with the lowest concentrations; and the urea + soybean meal ration with intermediate concentrations. Concentrations of ammonia-N were highest with urea and lowest with soybean meal. The urea ration was associated with a significantly lower (P < 0.01) total VFA concentration and more alkaline pH.

FOOTNOTES

1 Published with the approval of the Director of the Arkansas Agricultural Experiment Station.






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Copyright © 1967 by the American Dairy Science Association ®.