Document Detail

Effect of intraruminal propionic acid infusion on metabolism of mesenteric- and portal-drained viscera in growing steers fed a forage diet: II. Ammonia, urea, amino acids, and peptides.
MedLine Citation:
PMID:  8778105     Owner:  NLM     Status:  MEDLINE    
This experiment investigated the effect of intraruminal infusion of propionic acid on the net flux of nitrogenous compounds across the mesenteric- (MDV) and portal-(PDV) drained viscera of seven Friesian steers, average BW 127 kg (SEM 4.6), fed a grass-pellet diet. Each received by random allocation 0 (control), .5, or 1.0 mol of propionic acid/d for 7 d. Blood flow in mesenteric and portal veins was determined by downstream dilution of p-aminohippuric acid in order to determine net appearance rates across the gastrointestinal tissues. Net urea and ammonia flux was unaffected by propionic acid supply. Circulating plasma free amino acid concentrations were increased (P < .05) by propionic acid infusion (2,235, 2,428, and 2,427, error mean square [EMS] 44,370 microM, for control, .5, and 1.0 mol of propionic acid/d, respectively). Net amino acid flux rates were increased at the highest rate of propionic acid infusion across MDV and PDV (4.66, 3.69, and 6.11, EMS 2.98 mol/d for MDV [P < .05] and 2.98, 2.45, and 3.73, EMS 1.69 mol/d for PDV [P < .10] for control, .5, and 1.0 mol of propionic acid/d respectively). Positive venous-arterio concentration differences for peptide-bound amino acids (PBAA) across the MDV and PDV indicated net appearance across the gastrointestinal tissues, but this was not affected by propionic acid infusion. The data show that amino acid flux across postruminal tissues can be influenced by ruminal propionic acid supply and that this does not affect PBAA appearance.
C J Seal; D S Parker
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of animal science     Volume:  74     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1996 Jan 
Date Detail:
Created Date:  1996-09-17     Completed Date:  1996-09-17     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  245-56     Citation Subset:  IM    
Department of Biological and Nutritional Sciences, Faculty of Agriculture and Biological Sciences, University of Newcastle upon Tyne, U.K.
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MeSH Terms
Amino Acids / blood,  metabolism*
Ammonia / blood,  metabolism*
Cattle / metabolism*,  physiology
Chromatography, High Pressure Liquid
Mesenteric Veins / physiology
Peptides / blood,  metabolism*
Portal Vein / physiology
Propionic Acids / administration & dosage,  pharmacology*
Random Allocation
Urea / blood,  metabolism*
Viscera / blood supply*,  metabolism
Reg. No./Substance:
0/Amino Acids; 0/Peptides; 0/Propionic Acids; 57-13-6/Urea; 7664-41-7/Ammonia

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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