メン羊ルーメン細菌の硝酸代謝に及ぼす濃厚飼料の影響

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タイトル別名
  • The Influence of Concentrates on the Nitrate Metabolism of Microorganisms in the Rumen of Sheep
  • メンヨウ ルーメン サイキン ノ ショウサン タイシャ ニ オヨボス ノウコウ

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抄録

Experiments were conducted to investigate the effect of concentrates on nitrate metabolism of rumen microorganisms of sheep fed fresh high nitrate herbages. The chopped high nitrate Italian ryegrass and green amaranth were brought into the rumen of sheep through fistula with or without concentrates twice a day for about five days. The progressive increase of nitrite contents was recognized in the rumen of all animals received the Italian ryegrass alone, and the individual difference of nitrate reduction in the rumen seemed to be small in the late feeding period when rumen microorganisms adapted to nitrate. In the rumen of animals fed green amaranth, nitrate disappearance, nitrite appearance and followed disappearance were observed to be more rapid in animals fed with concentrates than those of animals fed without. This tendency was accelerated by increasing the concentrate intake. The ruminal pH did not fall to less than 6. 0 under these conditions and there were no wide differences of pH between with and without concentrates. The increase and followed decrease in blood methemoglobin were faster and their maximum values were lower in animals fed with concentrates. The addition of concentrates seemed to increase the rate of both nitrate and nitrite reduction by rumen microorganisms in vitro under the condition that the marked fall of media pH did not occur. From above results, it was concluded that the simultaneous feeding of concentrates with high nitrate herbages to ruminants might alleviate the severity of nitrate poisoning due to the rapid decrease and the fall of maximum values of methemoglobin in the blood, probably as the result of the vigorous reduction of nitrate and nitrite by rumen microorganisms.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 50 (11), 782-789, 1979

    公益社団法人 日本畜産学会

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