Abstract: Potato fibre (PF), a co-product of potato starch manufacture, was evaluated as a potential novel fibre source in dog food. Potato fibre contained 55% total dietary fibre, 29% starch, 4% crude protein, and 2% acid-hydrolysed fat.
The PF substrate was evaluated for chemical composition, in vitro digestion and fermentation characteristics, and in vivo responses. For the in vitro hydrolytic-enzymatic digestion and fermentation experiment, raw and cooked PF substrates were first subjected to hydrolytic-enzymatic digestion to determine OM disappearance and then fermented using dog faecal inoculum. Fermentation characteristics were then measured at 0, 3, 6, 9, and 12 h.
For the in vivo experiment, 10 female mixed-breed dogs (6.13 ± 0.17 yr; 22 ± 2.1 kg) were provided 5 diets with graded concentrations (0%, 1.5%, 3%, 4.5%, or 6%) of PF in a replicated 5 × 5 Latin square design. Dogs were acclimated to the test diet for 10 d, followed by 4 d of total faecal collection. Fresh faecal samples were collected to measure faecal pH and fermentation end products. In vitro digestion revealed that raw and cooked PF were 32.3% and 27.9% digested enzymatically, whereas in vitro fermentation showed that PF was fermentable through 9 h. Raw PF had greater (P < 0.05) acetate, propionate, and total short-chain fatty acid (SCFA) concentrations at the 12-h time point compared with cooked PF.
The in vivo experiment showed no differences in apparent total tract DM, OM, CP, acid-hydrolyzed fat, or energy digestibility of diets containing graded concentrations of PF. However, total dietary fiber digestibility exhibited a linear increase (P < 0.01) with increasing PF concentrations in the diet. Overall, linear increases (P < 0.01) were observed for all individual and total SCFA, with a concomitant linear decrease (P < 0.01) in faecal pH with increasing dietary PF. Faecal protein catabolite concentrations were low or undetectable, with the exception of spermidine, which exhibited a linear increase with increasing concentrations of PF.
These findings indicated that inclusion of PF elicited favourable fermentation characteristics without negatively affecting nutrient digestibility or stool characteristics, indicating that PF could be a functional dietary fibre source in dog foods.
Journal of Animal Science 2013, 91 (11): Potato fiber as a dietary fiber source in dog foods
M. R. Panasevich, M. C. Rossoni Serao, M. R. C. de Godoy, K. S. Swanson, L. Guérin-Deremaux, G. L. Lynch, D. Wils, G. C. Fahey Jr and R. N. Dilger