J. Anim Sci.
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J. Anim Sci. 1975. 40:963-967.
© 1975 American Society of Animal Science
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Influence of Ammonium Salts of Volatile Fatty Acids upon Portal Blood Ammonia Levels in Lambs1

Larry W. Varner2 and Walter Woods3

University of Nebraska, Lincoln

Abstract

Two experiments utilizing portal catheterized lambs were conducted to study the influence of nitrogen source upon portal blood ammonia (NH3) levels. In the first experiment, soybean flour, ammonium acetate (NH4C2), ammonium propionate (NH4C3), ammonium butyrate (NH4C4) or urea were sources of supplemental nitrogen. Supplying nitrogen in the form of soybean flour resulted in a significantly (P< .05) lower level of portal blood NH3 at all sampling times as compared to administration of nitrogen from NH4C2, NH4C3, NH4C4 or urea. Urea administration resulted in the highest level and most rapid rise in portal blood NH3 as compared to other nitrogen sources. NH4C2, NH4C3 and NH4C2 supported an intermediate level of portal blood NH3 between soybean flour and urea. Portal blood NH3 levels resulting from the administration of the different ammonium salts were similar. In the second experiment, urea, NH4C2 or urea plus acetic acid were administered to portal catheterized lambs. Urea and acetic acid were added to supply nitrogen and acetate in amounts equivalent to the NH4C2 treatment. Administration of urea resulted in a significantly higher level of portal blood NH3 at .5 and 1 hr after nitrogen administration compared to NH4C2 or urea plus acetic acid. NH4C2 or urea plus acetic acid supported similar levels of portal blood NH3 at all hours of sampling.

Footnotes

1 Published with the approval of the Director as Paper No. 3176 Journal Series, Nebraska Agriculture Experiment Station. Research reported was conducted under Project No. 13–14. The authors express appreciation to Allied Chemical Corporation for financial assistance for this project.

2 Present address: Texas A&M Research and Extension Center, P. O. Box 1051, Uvalde 78801.

3 Present address: Department of Animal Science, Purdue University, Lafayette, Indiana 47907.






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Copyright © 1975 by the American Society of Animal Science.