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Basic Beef Cow Nutrition Katherine Whitman, DVM, MS Great Plains Veterinary Educational Center
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Overview Recognizing a problem Basic requirements Matching cow cycle with forage cycle Critical time points in the cow cycle Evaluating feedstuffs BRaNDS program application Nutrition in practice
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Obvious…
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…Sub-clinical
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How do we know? Tools to evaluate nutritional status Body Condition Scoring https://beef.unl.edu/learning/condition1a.shtml Behavior? Health issues Increases is morbidity or mortality Unthrifty Ineffective preventatives, treatments Performance issues Reproductive deficiencies Poor growth
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Nutritional Requirements NRC for technicals Minimum requirements Feed values are averages Feed analysis is under utilized!! Sampling-what feedstuffs?
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What does she need? Age? Stage of production? Body condition? Environment? Feedstuffs available? Producer goals?
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Changes in requirement
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Production Cycle Lactation GrazingSupplement?
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Nutritional Demands Demands vary with physiologic state of cow Trimester Lactation Growth Other stressors
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Determining What to Feed Availability Cost Feasibility Quality
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Feedstuff Evaluation Testing LOOK!!! Ask questions
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What is the Focus? Major balancers Protein: 8% Cows, 13-14% Heifers (MINIMUMS!!) Energy: TDN, NE m, NE g, NE l Ca:P ratio-what is appropriate? Adjustments Supplementation??
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Forage dry matter intake relative to forage crude protein concentration Source: Adapted from Moore and Kunkle, 1995
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Carbohydrate Fractions Total Carbohydrate Nonfiber Carbohydrate Organic Acids Sugars Starches (NSC) Neutral Detergent Soluble Fiber Pectins Fructans ß-Glucans Structural Carbohydrate (NDF) Hemicellulose Acid Detergent Fiber Cellulose Lignin Maillard Protein Stimulate Fermentation Stimulate Milk Production Decrease Intake Increase Milk fat
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2 Year Olds1560 3 Year Olds1242 Matures5894 Calving season begins March 21 Wean October 20 Turned out to winter grazing Winter ration? Other questions? Case background
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Feeding options Supplemental forages Supplemental concentrates Corn stalks http://www.ianrpubs.unl.edu/epublic/live/ec290/build/ec290.pdf Dry lot http://www.ianrpubs.unl.edu/epublic/pages/publicationD.jsp?pu blicationId=1639 http://www.ianrpubs.unl.edu/epublic/pages/publicationD.jsp?pu blicationId=1639 https://beef.unl.edu/confinement-cows-series-part-1-nutritional- considerations https://beef.unl.edu/confinement-cows-series-part-1-nutritional- considerations
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Reading Feed Analysis As Fed100% Dry Matter Moisture, %7.3 Dry Matter, %92.7 Crude Protein, % CP19.521.0 Acid Detergent Fiber, % ADF26.628.7 Neutral Detergent Fiber, % NDF35.438.2 Total Digestible Nutrients, % TDN65.370.4 Net Energy, Maint, Mcal/lb0.700.75 Net Energy, Gain, Mcal/lb0.440.47 Net Energy, Lact, Mcal/lb0.680.73 Digestible Energy, Mcal/lb1.311.41 Met. Energy, Beef, Mcal/lb1.071.16 Relative Feed Value, (RFV) 162 Calcium, % Ca1.181.28 Phosphorus, % P0.270.29 Magnesium, % Mg0.250.27 Potassium, % K2.933.16 Near Infrared Reflectance Spectroscopy (NIRS) Analysis
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Ration formulation Scratch paper Rules of Thumb Excel spreadsheets Numerous online resources Software programs BRaNDS BRaNDS.xlsm NRC D:\NRC\UNL Practicum Revised NRC - November 2013.xls D:\NRC\UNL Practicum Revised NRC - November 2013.xls
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