低たんぱく飼養ブタの食餌添加尿素利用性の^<15>Nによる研究

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To investigate effect of a low protein diet on urea utilization, a tracer study was conducted with ^<15>N-urea on pigs fed a low protein diet (DCP 5.7%) with 2% urea (group B), and on pigs fed an optimal protein diet (DCP 13.3%) with 2% urea (group A). ^<15>N was incorporated into protein of liver, serum and muscle, which were obtained 8 days after the last administration of ^<15>N-urea. The ^<15>N incorporation rate into the tissue protein tended to be higher in group B than in group A. Approximately 70% of ^<15>N, however, was excreted into urine within 48 hours in group B. A comparison was made on growth and urea level in blood and urine to evaluate efficacy of the administered urea on growth between group B pigs and pigs fed the same low protein diet without urea supplementation (group C). Since group B pigs always maintained a higher level of blood urea, they were considered to have had more ammonia nitrogen which was available for protein synthesis than group C animals. A similar amount of urea to ingested dose, however, was excessively eliminated in urine. The increased ammonia nitrogen by urea ingestion may be excreted in form of urinary urea in group B pigs. There was no difference in growth between group B and group C animals; therefore, poor efficacy of administered urea on growth may have resulted not only from its loss into urine in early stage after ingestion, but also to poor utility of ammonia for protein synthesis.
社団法人日本獣医学会の論文
1978-10-25

低たんぱく飼養ブタの食餌添加尿素利用性の^<15>Nによる研究

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