"nutrient digestibility" refers to how well our body can break down and absorb the nutrients from the food we eat. It tells us how effective our body is at getting the essential nutrients from the food to use for energy and growth.
Full definition
Diets that dilute calories with high fiber lead to increased stool volumes, frequent urges to defecate and variable decreases
in nutrient digestibility.
Alternatively, improvements in ingredient quality and manufacturing process to
optimize nutrient digestibility and bioavailability can have a positive impact on pet health and nutritional sustainability.
On histological examination, changes are evident in the salivary glands, small intestine, liver and pancreas of older dogs (Mundt, 1991), however these changes do not reduce
apparent nutrient digestibility in dogs (Lloyd & McCay, 1954; Lloyd & McCay, 1955; Sheffy et al., 1985; Buffington et al., 1989; Taylor et al., 1995).
Interactions of fermentable carbohydrate and protein on
nutrient digestibility, performance and enteritis in weanling rabbits.