Alterations in the Microbiome of Horses Affected with Fecal Water Syndrome
2025
Madison M. Porter | Daniel J. Davis | Zachary L. McAdams | Kile S. Townsend | Lynn M. Martin | Christopher Wilhite | Philip J. Johnson | Aaron C. Ericsson
Fecal water syndrome (FWS) in horses is characterized by two-phase defecation, including both solid and liquid phases. While satisfactory explanations for FWS are unavailable, bacterial dysbiosis has been suggested as a contributing or causative factor. The objectives of this study were to determine whether fecal bacterial dysbiosis is associated with FWS in horses in the midwestern USA. Fecal samples were collected from horses with FWS and from unaffected horses at the same location. In total, 16S rRNA amplicon libraries produced from fecal bacterial DNA were sequenced using the Illumina sequencing platform. Significant differences in beta diversity were detected between affected and control horses (<i>p</i> = 7 × 10<sup>−4</sup>, F = 1.51), and differential abundance testing identified several features enriched in affected and control horses. These results agree with prior work regarding specific features in the bacterial microbiome associated with FWS, including <i>Alloprevotella</i> spp., and suggest fecal dysbiosis is associated with FWS.
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