NUTR 3210 Lecture Notes - Lecture 6: Negative Energy, Ge Power, Cardiovascular Disease
27 Sep 2016
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Digestibility: measure of the fraction of a specific nutrient or of energy that is extracted by the gi tract, measured by 2 methods: total collection and indicator (sometimes called marker) methods. Calculation of digestibility coefficient (between 0 and 1) ** this is important to calculate bioavailability (how available are these nutrients to the organs) Assume that all of the contents of the feces are non-digested materials originating from the diet. ** these are small contributions so we normally ignore them, but there are more specific ways to determine digestibility. ** water does not affect it because calculations are done n a dry weight basis. Requires that a specific component in the food be identified as a marker. The marker can be: internal (a natural component of the feed, for example lignin, external (a component added to the feed for example silica, ferric oxide, chromic oxide)
