Effects of Temperature, Moisture and Cellulases on the Fermentation Quality and Chemical Composition of Naked Barley (Hordeum vulgare L. emand Lam) Straw Silage

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  • 環境温度,水分含量およびセルラーゼの添加がハダカムギ麦稈サイレージの発酵品質と化学成分に及ぼす影響
  • Effects of Temperature Moisture and Cel

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Abstract

Effects of temperature levels, moisture contents and cellulases on the fermentation quality and chemical composition of naked barley straw silage were investigated in two laboratory-scale experiments. In experiment 1, naked barley straw added with Acremonium cellulase (AC) or Meicelase (MC) was ensiled and stored in incubators at 10, 20, 30, 40 and 50℃, respectively. In experiment 2, naked barley straw with moisture contents of approximately 50, 60, 70 and 75% adjusted with distilled water, was added with or without the above cellulases, ensiled and kept in the laboratory at room temperature. All silages below 40℃ had a more extensive fermentation than that at 50℃, and the highest butyric acid contents occurred at 30℃, irrespective of types of cellulase additives. The silages added with cellulase were well-preserved with pH values of 4.3 or less and high lactic acid content compared with the control. Moreover, AC additive was more effective than that of MC throughout temperature condition. Moisture contents had marked effect on the fermentation quality of silages. There were lower pH and higher lactic acid content in silages with a moisture content of 60%. The silages with moisture contents of 50% and 75% were of high pH values and the latter produced high butyric acid and VBN contents. Cellulase additives obviously improved the silage fermentation quality, particularly for the silages with the moisture content from 60% to 70%. Contrasting two cellulases, AC was superior to MC under any moisture condition. Cellulase as an additive partially degraded the structural carbohydrates of silages and decreased the contents of NDF, ADF and cellulose in comparison with the control silage, although it was not significant in both experiments.

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