Occurrence of intraportally‐infused urea‐15N in the urine of domestic fowl

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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 1SN) 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.