ANSC 3080 Lecture 3: Feed Analysis
8 Dec 2017
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Feed labels: ash = mineral content, given mins and maxes, to give flexibility and account for variability of feed ingredients. Cho: lipids, startch or sugars, most protein, things avaliabel for microbial fermentation, called cell contents, acid detergent fiber (adf, extract plant tissue with acid solutions, solubilizes hemicellulose and cell wall proteins, leaves behind, cellulose, cutin, lignin, silicia. Indigestible nitrogen (bound nitrogen: silica mineral fraction, acid detergent lignin (adl, take adl residue and treat with h2so4, removes cellulose and can measure lignin concentrations, acid detergent insoluble nitrogen (adin, quantifies indigestible nitrogen. Startch in corn vs cellulose in forages: no difference since looking at bomb calorimeter energy so no digestion involved. Net energy (ne: portion of me used for maintenance and production, ne = me hi, hi = heat increment heat made by animal from nutrient digestion and metabolism. Includes microbial fermentation: corn vs roughages which makes more heat from fermentation, more heat from roughages due to more work, applications.
