反芻動物の低マグネシウム血症に関する実験的研究 : I. 冬季飼料から春の牧草に転換した羊のミネラル・バランスについて

DOI 日本農学文献記事索引 Web Site Web Site PubMed 被引用文献2件

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タイトル別名
  • Experimental Studies on Hypomagnesemia of Ruminants : I. Mineral Balance in Sheep at the Time of Change from Winter Ration to Spring Herbage
  • ハンスウ ドウブツ ノ テイ マグネシウム ケッショウ ニ カンスル ジッケン

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A mineral balance was examined in five non-pregnant ewes that had been fed a typical winter ration (hay and concentrates) for 16 days, spring herbage (orchard-grass solely) for the following 14 days, and again the winter ration for the last 7 days. Magnesium metabolism was evaluated in relation to other mineral (Ca, P, K and Na) metabolism. With regard to chemical constituents calculated from the daily consumption of crude protein, crude fat and crude fiber, the contents of the spring herbage were nearly the same as those of the winter ration, although they varied with the latter in mineral and nitrogen-free extracts. The spring herbage contained much more potassium, but less calcium, magnesium, phosphorus and sodium than the winter ration. When feed was changed from the winter ration to the spring herbage, each rate of fecal and urinary excretion to Ca, P and Mg intake markedly increased and these mineral balances became negative. Consequently, Mg and inorganic P levels significantly fell, but Ca did not in blood serum. When feed was changed from the spring herbage to the winter ration, these minerals again showed a positive balance and serum Mg and P levels increased to the initial values. An increase in the fecal and urinary excretion of K and Na decreased these mineral balances to a small extent, but the serum levels of these minerals did not change. Significant positive correlations were found between the fecal excretion of Mg and that of Ca, P, K or Na and between Mg balance and Ca or P balance during the herbage-feeding period. Moreover, there was a signiticant positive correlation between the urinary excretion of Mg and that of Ca. It seemed that a close parallel relationship might exist between Ca and Mg in the fecal and urinary excretion and balance.

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