ANSC 3120 Lecture Notes - Lecture 14: Rumen, Gravimetry, Polyethylene Terephthalate
19 Nov 2016
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%digestibility = amount of nutrient consumed amount of nutrient in feces /amount of nutrient consumed. Done w. total dm or any nutrient or nutrient factor (om, cp, starch, ndf, adf, ee) Measure all feed inputs and all fecal output. = metabolism crates (can collect urine and measure n retention but animal confined, limited movement, welfare) = fecal collection bags (basically a diaper, welfare issues again) = use of marker or reference indicators - no welfare concern. May be switching animals to drastically different diets: all forage to all concentrate diet. Want to clear git of indigestible materials from past diets as these will contribute to fecal outputs. Lowers digestibility value of the feed of interest. Feces will include losses of metabolic origins and microbial production: Measuring intake to see if its practically palatable will the animal eat it. Some in urine so don"t know the true digestibility just from the feces.
