title: Occurrence of intraportally-infused urea-15N in the urine of domestic fowl.
abstract: 1. Measurements were made in situ to determine the occurrence of intraportally infused urea-15N in ureteral urine of the fowl. 2. Of the total amount of infused urea-15N, 15% was excreted intact into the urine (90% of urinary total 15N) whereas 9% remained unchanged in the blood (78% of blood non-protein-15N). 3. The proportions of non-protein-15N in the blood, liver and kidney were 12, 3 and 1%, respectively of the infused 15N. Protein-15N was 3% of that infused in blood and much less in liver and kidney. 4. About 1% of the infused 15N was observed in the urinary uric acid, and 3% of the infused 15N in non-protein N, other than urea, ammonia and glutamine amide N, of blood and liver. 5. No appreciable amounts of 15N were present in ammonia and glutamine amide N of blood, liver or kidney and in uric acid of liver or kidney. 6. The caecal contents contained about 1% of the infused 15N with 15% of this as ammonia-15N. 7. It is concluded that intraportal urea is mostly excreted unchanged into ureteral urine of the fowl.
authors.affiliation: Laboratory of Animal Nutrition and Feed Science, Faculty of Agriculture, Shinshu University, Nagano-ken, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Karasawa
authors.forename: T
authors.initials: T
authors.lastname: Koji
authors.forename: M
authors.initials: M
authors.lastname: Maeda
mesh_terms: D000818:Animals; D002645:Chickens / Q000097:blood / Q000652:urine*; D007262:Infusions, Intravenous / Q000662:veterinary; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008297:Male; D011169:Portal Vein; D014508:Urea / Q000097:blood / Q000493:pharmacokinetics / Q000652:urine*
chemical_list: D014508:Urea