NUTR 3210 Lecture Notes - Lecture 4: Bacterial Growth, Particle Size, Calorie
30 Jan 2017
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Document Summary
Measure of the fraction of a specific nutrient (or of energy) that is extracted by the gi tract. Calculated from the amount of nutrient in the diet and the amount appearing in the feces. Represents a combination of nutrient release from the food matrix, microbial fermentation, and absorption. Why is this important: prevents deficiency and ensures essential nutrients are available to the organism. Allow the animal to adapt to the diet over a 7-21 day period to allow accuracy. Measure intake over a 3-10 day period. Apparent digestibility coefficient = (total intake total feces)/(total intake) [(total mass intake x % nutrient intake) (total mass expelled x % nutrient expelled)] / (total mass intake x % nutrient intake) Metabolic cages create anxiety in animals: collect and analyze urine and feces. Also, (cid:396)efe(cid:396)(cid:396)ed to as the (cid:858)(cid:373)a(cid:396)ke(cid:396) te(cid:272)h(cid:374)i(cid:395)ue(cid:859) Internal (a natural component of feed: external (a component added to feed)
