ADSC 2010 Lecture 13Outline of Last Lecture I. Categories of FeedstuffsA. Concentratesa. Cereal Grainsb. Oilseedsc. By-ProductsB. Roughagesa. Legumesb. Grassesc. Forms of Roughages1. Pasture2. Hay3. Silage & HaylageII. Proximate Analysis of FeedstuffA. Six ComponentsB. Feed ChartIII. Digestibility of FeedstuffA. ExamplesOutline of Current LectureI. Measurement of Energy in FeedstuffA. Nutrients that contribute to energyB. Two methods to estimate energy1. Total Digestible Nutrient (TDN)2. Metabolizable Energy (ME) & Net Energy (NE)II. Basic Ration BalancingA. Pearson SquareCurrent LectureI. Measurement of Energy in FeedstuffA. Nutrients that contribute to energy contentCHOs, Lipids, ProteinsB. Two methods to estimate energy content1. Total Digestible Nutrient (TDN): based on the proximate analysis and digestibility measures for a feed- % digestible protein + % digestible fat (x 2.25) + % digestible crude fiber + % digestible NFE- Factors influencing TDN:a. Dry matter contentb. Nutrient Digestibilityc. Ash contentd. Fat content- Calculating TDN- 100 lbs of feed (as-fed basis) - Dry matter content 91.5#CP CFat CF NFEFeed 8.7# 2.01# 27.89# 48.22#Feces 4.4# .894# 18.32# 18.32#Digest. 49.4% 55.5% 34.3% 62%Dig. Nutr. 4.3# 2.5# 9.6# 29.9#TDN: 46.3 # or %TDN(DM basis): 46.3/91.5= 50.6%2. Metabolizable Energy (ME) & Net Energy (NE): more common- partitioning of energyII. Basic Ration Balancing- Formulate a swine diet with 16% CP utilizing corn (8.9%) and a commercial protein supplement (36%)0.089x + 0.36(1-x) = 0.160.089x + 0.36 – 0.36x = 0.16-0.271x = -0.20Gross energy: bomb calorimeter: KCal/gram or MCalDigestibile Energy: Dig. Nutr. ContenLoses enegy through uring and gases: 6% urine and 5-20% gases: Cattle & Sheep ruminants (bacteria & microorg.)Metaolizable Energy: Collect Urine and gasesLoses energy in the form of heatNet EnergyMaintinance (NEm)Production (NEg or NEl)Loses energy in feces20% in concentrates40-50% in RoughagesX = 0.738Corn: 73.8% Suppl.: 26.2%A. Pearson SquareCorn: 8/9 20Supp: 36 7.1Total: 27.1Corn: 20/27.1 = 73.8%Supp: 7.1/27.1 =
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