酵母摂取にともなう哺乳子ヤギの尿中へのアラントイン排泄の増加

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タイトル別名
  • Increased Urinary Excretion of Allantoin in Pre-ruminant Kids Caused by Yeast Ingestion
  • コウボ セッシュ ニ トモナウ ホニュウコ ヤギ ノ ニョウチュウ エ ノ ア

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We clarified the relationship between the amounts of nucleic acids entering the small intestine and those of allantoin excreted in the urine using pre-ruminant kids given Torula yeast (nucleic acid content; 11.0%, purine base content; 17.6mmole/100g) as the source of nucleic acids. The kids were given a liquid diet with and without yeast by nipple-feeding. In Expt. 1, 4 kids (each 3 weeks old) were used. They were given cow's milk, a yeast milk replacer (contained Torula yeast as the sole source of protein) and an ISP milk replacer (contained isolated soybean protein, ISP, as the sole source of protein) for the 1st, 2nd and 3rd weeks from the start of the experiment, respectively. Urine was collected daily. In Expt. 2, 4 kids were given cow's milk with additional Torula yeast for a week. Daily amounts of yeast added were 15g, 30g, 45g and 60g. During the last 3 days of each period, urine was collected daily. As a result, in Expt. 1, the urinary excretion of total and urea nitrogen changed in parallel with nitrogen intake. That is, ISP milk replacer>yeast milk replacer>cow's milk. The most significant change was an increase in the urinary excretion of allantoin, with a concominant intake of the yeast milk replacer. Daily allantoin excretions were 600-700mg (3.8-4.4mmole) when the kids ingested the yeast milk replacer, whereas excretions were about 100mg (0.63mmole) when the kids ingested cow's milk or the ISP milk replacer. In Expt. 2, there was a significant correlation between the amounts of yeast purine base ingested and urinary allantoin excretion. The regression equation is Y=0.506X-0.065: where Y is daily urinary excretion of allantoin expressed as mmole, X is daily purine base intake expressed as mmole. It shows that over 50% of purine base contained in Torula yeast is excreted rapidly into urine as allantoin. From these results, we concluded that preruminant kids can digest, absorb and metabolize large amounts of nucleic acids entering the small intestine before weaning. The results also suggest that absorption of dietary nucleic acids affects purine metabolism in kids.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 59 (5), 395-401, 1988

    公益社団法人 日本畜産学会

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