| 摘要 |
A method of rearing useful organisms such as cultured animals which is effective in preventing the organisms from diseases, treating the organisms for diseases or maintaining the health of the organisms, characterized by administering to the organisms (1) a product of heat treatment of at least one compound selected from the group consisting of (a) uronic acid and uronic acid derivatives, (b) sugar compounds containing uronic acid and/or uronic acid derivatives and (c) substances which contain sugar compounds containing uronic acid and/or uronic acid derivatives, (2) 4,5-dihydroxy-2-cyclopenten-1-one represented by formula (I), and/or (3) a 4,5-dihydroxy-2-cyclopenten-1-one derivative; and feeds effective therein.
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