Five isolates that produced large amounts of butyrate were obtained in the course of a study on the butyrate-producing microbiota from the caecal content of a 4-week-old broiler chicken. The five isolates were virtually indistinguishable in biochemical and genetic terms, suggesting that they were derived from a single bacterial clone colonizing this habitat. A phylogenetic analysis based on 16S rRNA gene sequences demonstrated that the five isolates represented a unique lineage within the subgroup of the clostridia, with as the closest phylogenetic neighbour (about 93 % similarity). These data indicate that the five novel isolates represent a single novel species within a novel genus, for which we propose the name gen. nov., sp. nov. The type strain of is 25-3 (=LMG 24109 =CCUG 55265). The DNA G+C content of strain 25-3 was 54.5 mol% .


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Randomly amplified polymorphic DNA genomic patterns of isolates. Lanes: 1, 7 and 13, marker lanes; 2–6, amplification profiles of isolates 49-3, 54-3, 25-3 , 11-3 and 44-3, respectively, obtained using primer 5′-TGCGCGCGGG-3′; 8–12, amplification profiles of isolates 49-3, 54-3, 25-3 , 11-3 and 44-3, respectively, obtained using primer 5′-AGCGGGCCAA-3′.


Repetitive-element-primed PCR genomic patterns of the five butyric-acid-producing strains isolated from the caecal content of a broiler chicken. Primer (GTG) was used.


Scanning electron micrograph of cells of strain 25-3 .

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