Abstract
Intestinal lymphangiectasia (IL) is a common complication in dogs. This study analyzed intestinal microbiota using 16S rRNA amplicon analysis as candidate factors that strongly influence the small intestinal lymphatic vessels in dogs with and without IL. Twelve dogs were included, of which six were diagnosed with lymphoplasmacytic enteritis, four with small-cell lymphoma, and two with large-cell lymphoma. Seven of these dogs had IL, whereas five did not. First, the microbial diversity analyzed by Faith pd index was significantly decreased in dogs with IL compared to dogs without IL. Then, the relative amounts of each bacterial taxa were compared between dogs with and without IL using Linear discriminant analysis effect size analysis. At the genus level, the Ruminococcus gnavus group significantly increased in dogs with IL compared to dogs without IL. A total of four genera, including Ruminococcus torques group and Faecalibacterium, which produce butyrate, significantly decreased in dogs with IL. This study showed decreased intestinal bacterial diversity and several alterations of intestinal microbiota, including a decrease in butyrate-producing bacteria in dogs with IL, compared to dogs without IL.
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