Abomasal Nitrogen in Steers Fed Soybean Meal, Urea or Urea Plus Two Levels of Molasses

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Abstract
The quantity and quality of nitrogen reaching the abomasum of steers fed SBM, urea, urea and 2.5% molasses or urea and 10.0% molasses were determined using four abomasal fistulated steers in a 4×4 latin square. Total nitrogen reaching the abomasum, estimated by nitrogen:chromic oxide ratios was determined and separated into protein, bound-amino and free-amino nonprotein nitrogen and purine-pyrimidine nitrogen. Quantitative estimates revealed that only 79.4% as much nitrogen reached the abomasum in steers fed urea as in steers fed SBM. Addition of 2.5% molasses to urea increased daily abomasal nitrogen to 92.5% of that from SBM feeding, and addition of 10.0% molasses to urea was of no benefit over 2.5% molasses. While differences between means were not statistically significant (P>.05), significant treatment effects were recorded at P<.2. Abomasal nitrogen composition was similar on all rations with the urea ration showing somewhat lower quantities of purine-pyrimidine nitrogen. There were no differences due to ration treatment in the amino acid composition of abomasal contents. Copyright © 1971. American Society of Animal Science. Copyright 1971 by American Society of Animal Science.

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