Distribution of Fusarium among the Feeds and the Producibility of Fusarium Toxins

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  • 家畜飼料のFusarium分布とFusariumカビ毒産生性
  • カチク シリョウ ノ Fusarium ブンプ ト Fusarium カビ ド

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We investigated the distribution of Fusarium in the cattle and horse feeds, for 10 months in Tokachi district, Hokkaido. The collected samples were hay, rice straw and silage. These feeds were highly contaminated by various kinds of fungi. Hay and rice straw were widely distributed by field fungi such as Alternaria, Aspergillus, Cladosporium, Mucur and Penicillium. In silage Aspergillus (A. fumigatus), Geotrichum and Mucor were frenquently detected. Hay and rice straw were extensively contaminated with Fusarium. Dominant species of Fusarium was F. graminearum which occupied more than 50%, 29 of 53 isolates. As the simple detection of the producibility of Fusarium toxins of trichothecenes, the rabdit skin tests of fungal extracts of all the isolates were carried out and 3 strains markedly showed inflammatory changes, in which 2 strains were F. graminearum and the other was Fusarium sp. From the results of chemical and biological assay, the production of T-2 toxin, neosolaniol and diacetoxyscirpenol was presumed. In this paper we discussed the distribution of Fusarium the feeds and the producibility of Fusarium toxins.

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