Effect of Steam Treatment on Chemical Composition and <I>In Vitro</I> Dry Matter Digestibility of Tropical Grasses

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  • TOKITA Norio
    Faculty of Applied Life Science, Nippon Veterinary and Animal Science University
  • AKIYAMA Hiroko
    Faculty of Applied Life Science, Nippon Veterinary and Animal Science University
  • KAWAMURA Sanae
    Faculty of Applied Life Science, Nippon Veterinary and Animal Science University
  • KONTA Masahiko
    Faculty of Applied Life Science, Nippon Veterinary and Animal Science University
  • SHIMOJO Masataka
    Laboratory of Animal Feed Science, Kyushu University
  • MASUDA Yasuhisa
    Laboratory of Animal Feed Science, Kyushu University

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  • 暖地型イネ科牧草の成分組成および消化性に及ぼす蒸気加熱処理の影響
  • ダンチガタ イネカ ボクソウ ノ セイブン ソセイ オヨビ ショウカセイ ニ オヨボス ジョウキ カネツ ショリ ノ エイキョウ

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Abstract

The effect of low-pressure steam treatment (1.2kg/cm2, 20min) on chemical composition and on in vitro dry matter digestibility of three tropical grasses at the different growth stages was investigated. Treatment decreased by 2∼3.3% the crude protein content of green panic (GP) and colored guinea grass (CG) at the late blooming stage, and increased by 3.5∼6.5% the neutral detergent fiber of the leaf fraction of GP and CG. Treatment decreased by 2.6∼3.9% the acid detergent fiber of rhodes grass (RG) in leaf and stem fractions at all stages, but the acid detergent lignin (ADL), silica, and gross energy (GE) contents remained constant in spite of the treatment. Only 4∼8% improvement of in vitro dry matter digestibility was in the stem of CG and the leaf of RG at the pre-blooming stage. The results suggested that low-pressure steam treatment might cause a decrease in crude protein content and an increase in in vitro dry matter digestibility of tropical grasses, but these effects will be different depending on grass species, growing stages, and grass parts. The steam treatment in this experiment did not cause any significant changes in ADL and GE contents.

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