The Effect of Diet Change and Insulin Dysregulation on the Faecal Microbiome of Ponies

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Danielle M. Fitzgerald, Robert J. Spence, Zachary K. Stewart, Peter J. Prentis, Martin N. Sillence, and Melody A. de Laat

The equine microbiome can change in response to dietary alteration and may play a role in insulin dysregulation. The aim of this study was to determine the effect of adding pasture to a hay diet on the faecal bacterial microbiome of both healthy and insulin-dysregulated ponies. Faecal samples were collected from 16 ponies before and after dietary change to enable bacterial 16S rRNA sequencing of the V3–V4 region. The dominant phyla in all samples were the Firmicutes and Bacteroidetes. The evenness of the bacterial populations decreased after grazing pasture, and when a pony was moderately insulin dysregulated (P=0.001). Evenness scores negatively correlated with post-prandial glucagon-like peptide-1 concentration after a hay-only diet (r²=–0.7, P=0.001). A change in diet explained 3% of faecal microbiome variability. We conclud... View the full article at the Journal of Experimental Biology (JEB) Blog.

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