USE OF NITROGEN-15 LABELLED UREA TO STUDY UREA UTILIZATION BY PIGS

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Abstract
Two experiments were conducted, the first to determine the rate and pattern of nitrogen excretion when weanling pigs were fed a diet containing urea, and the second to study the incorporation and excretion of 15N-labelled urea in weanling pigs. The 15N of dietary 15N-urea was incorporated into the trichloroacetic acid-insoluble fractions of liver, blood plasma, intestinal mucosa, skeletal muscle, and blood cells of 10.3-kg pigs. Blood plasma and liver were enriched to the greatest extent. More 15N, as a percentage of the administered dose, was used in muscle protein synthesis than in liver protein synthesis. Excretion of 15N in the urine during 48 h following administration of 15N-urea in a diet containing 2% urea accounted for 52.2% of the administered dose; excretion during the subsequent 48 h accounted for 1.9% of the administered 15N. The results indicate that dietary urea is used in protein synthesis by the pig.

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