Acacia fiber is a soluble dietary fiber derived from the gum exudate of acacia trees. This fiber is commonly used in the pet food industry as a gelling and emulsifying agent, though its effects on feline gastrointestinal health are not well understood. The current experiment used a batch in vitro system and feline fecal inoculum to mimic the colonic bacterial fermentation process and assess the fermentation characteristics of an acacia fiber blend, inulin, pectin (positive control), and cellulose (negative control). As expected, cellulose was poorly fermented, whereas inulin and pectin underwent rapid and extensive fermentation, increasing short-chain fatty acid (SCFA) and gas production, and reducing pH. In comparison, acacia fiber was slowly fermented, producing moderate SCFA concentrations and very little gas. Fermentation of acacia fiber increased bacterial diversity and richness and promoted the proliferation of beneficial bacterial taxa such as Bacteroides, Blautia, and Faecalibacterium and limiting the growth of bacterial groups associated with unfavorable gastrointestinal processes such as Fusobacterium, Peptoclostridium, and Sutterella. Overall, these results suggest that acacia fiber is a moderately fermentable fiber that may support feline gastrointestinal health without excessive gas production. However, research on live animals is necessary to validate these effects.

Read the full article in the Journal of Animal Science.