Petfood Industry - October 2017 - 43
www.PetfoodIndustry.com | 43
status and environmental exposures, of which diet is
an important component," Swanson explained.
Dog food strongly affects the intestinal community of microorganisms, he said. Factors like the ratio
among fiber, resistant starch and protein influence the
quantity and type of organisms in the microbiota.
"The quality and chemical composition of the
ingredients and nutrient digestibility are key factors,"
he said. "That is an important factor in our study,
because the ingredient list, chemical composition
(nutrient profile) and nutrient digestibility was quite
different among diets. The mildly cooked and raw
diets were generally higher in protein and/or fat and
were more digestible than the extruded diet."
Extruded, raw and lightly cooked dog foods
The lightly cooked and raw diets both caused
changes in the dog's microbiota analogous to those seen
in people eating high-fat, high-protein human diets.
"Looking more specifically at the individual bacterial groups, the mildly cooked and raw diets tended to
increase fecal Bacteroides and Fusobacterium and reduce
fecal Bifidobacterium, all changes known to occur with
Western-type diets," said Swanson.
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However, despite having a higher fat content than
extruded dog food, both lightly cooked and raw diets
seemed to reduce blood triglyceride concentration, which
would be considered beneficial long term. The biological
reason for this is unknown.
Dogs fed the extruded diets had the highest diversity of microbe species in their feces. Extruded dog
foods also tended to differ in the collective presence
and abundance of all bacteria across experimental
"In addition, dogs eating the raw diet had greater fecal
Lactobacillus and Pediococcus and reduced fecal Blautia and
Clostridium," he said.
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