Effect of Gamma Irradiation on Microflora and Fermentation Quality of Alfalfa, Orchardgrass, Maize and Sorghum Silages.

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  • TANAKA Osamu
    National Grassland Research Institute:Tohoku National Agricultural Experiment Station
  • AKIYAMA Fumiaki
    National Grassland Research Institute
  • YAMADA Akihisa
    National Grassland Research Institute
  • ANDO Sada
    National Grassland Research Institute:Chugoku National Agricultural Experiment Station
  • UEGAKI Ryuichi
    National Grassland Research Institute:National Institute of Agro-Environmental Sciences
  • KOBAYASHI Ryoei
    National Grassland Research Institute:National Institute of Animal Industry
  • KUME Tamikazu
    Japan Atomic Energy Research Institute

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Other Title
  • アルファルファ, オーチャードグラス, トウモロコシ及びソルガムのサイレージの微生物相及び発酵品質にγ線照射が及ぼす影響
  • アルファルファ オーチャードグラス トウモロコシ オヨビ ソルガム ノ サイレージ ノ ビセイブツソウ オヨビ ハッコウ ヒンシツ ニ ガンマセン ショウシャ ガ オヨボス エイキョウ

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Abstract

We prepared laboratory-scale silages of alfalfa (Medicago sativa L.), orchardgrass (Dactylis glomerata L.), maize (Zea ,mays L.) and sorghum (Sorghum bicolor Moench), irradiated them with gamma rays prior to storage and examined microflora and fermentation quality of them. Spore-forming anaerobic bacteria, which can cause butyric fermentation of silage, were eliminated from the silages with an 8 kGy dose. Molds and yeasts, which can cause aerobic deterioration of silage, were eliminated from the silages with doses of 4kGy and 16 kGy, respectively, whereas 10^2 cfu/g of aerobic bacteria were still detected from the silages exposed to a 16 kGy dose. The silages which were exposed to a dose of more than 6.6 kGy contained only less than 10^4 cfu/g of lactic acid bacteria and little lactic acid and they were of near neutral pH. These results suggested that at least a 16 kGy dose is necessary to inhibit butyric fermentation and aerobic deterioration of silage.

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