反芻胃内微生物による非蛋白態窒素化合物の利用におよぼす アミノ酸及び硫黄源の影響

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  • The Effect of Amino Acids and Sulfur Compounds on the Utili-zation of Non-Protein Nitrogen by Rumen Microorganisms <i>in Vitro</i>, with Special Remark to L-Methionine
  • ハンスウイ ナイ ビセイブツ ニ ヨル ヒタンパクタイ チッソ カゴウブツ ノ リヨウ ニ オヨボス アミノサン オヨビ イオウ ゲン ノ エイキョウ エイブン

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In a series of in vitro experiments, the effects of amino acids and sulfur compounds, especially L-methionine, on the utilization of non-protein nitrogen (NPN) by rumen microorganisms were studied. Incubation media used in this study consisted of 10ml of strained rumen fluid, 30ml of the mineral solution and 0.6g of corn starch as a basal medium with various nitrogen and sulfur sources added. The results obtained are summarized below. (1) The amount of microbial protein synthesized during 6 hours of incubation was greater in the tube with amino acid mixture (control) than that in any of the other tubes from which a certain group of amino acids was removed. When sulfur-containing amino acids were removed, the amount was significantly less (P<0.05) compared with the control. (2) Of the twelve amino acids tested, only L-methionine significantly (P<0.05) increased the utilization of urea. These results suggest that L-methionine is one of the most important nutritional factors influencing the utilization of NPN by rumen microorganisms. (3) A negligible or negative effect of L-methionine on microbial protein synthesis was found when casein or an amino acid mixture was supplied to the medium as the sole source of nitrogen. (4) At 6 hours of incubation the amount of microbial protein in the tube with L-methionine was higher (P<0.05) than that in the tube with K2SO4 as sulfur sources. (5) The effect of L-methionine on rumen bacterial protein synthesis was also observed.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 45 (9), 494-501, 1974

    公益社団法人 日本畜産学会

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