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Computer Applications in Beef Nutrition

Computer Applications in Beef Nutrition. Dan Loy Iowa State University An Sc 519. Why computer formulation?. Allow simultaneous diet formulation using complex nutrient models Metabolizable protein systems Net energy Dry matter intake predictions

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Computer Applications in Beef Nutrition

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  1. Computer Applications in Beef Nutrition Dan Loy Iowa State University An Sc 519

  2. Why computer formulation? • Allow simultaneous diet formulation using complex nutrient models • Metabolizable protein systems • Net energy • Dry matter intake predictions • Factorial requirements of nutrients requiring production estimates

  3. Types of beef nutrition computer programs • Ration balancing • automates hand calculation • Ration analysis • evaluates ration for nutritional adequacy • Least cost formulation • linear programming to minimize costs within nutritional constraints

  4. Linear Programming -- Minimization

  5. Minimization Model • Minimize cost = $1X1 + $2X2 • Subject to: • 1X1 + 1X2 >=10 (Calcium) • 3X1 +1X2 >=15 (Protein) • 1X1 +6X2>=15 (Calories) • And • X1>=0, X2>=0

  6. X2 15 (0,15) 3X1 + 1X2 = 15 Feasible Region 10 1X1 + 1X2 = 10 (2.5,7.5) 5 1X1 + 6X2 = 15 (9,1) (15,0) X1 15 5 10

  7. X2 15 (0,15) Feasible Region 10 (2.5,7.5) Cost =$1X1 + $2X2 =$1(9) + $2(1) = $11 SOLUTION 5 (9,1) (15,0) X1 15 5 10

  8. ISU Beef Management Software • MCS Spreadsheet Series • A series of six worksheet templates to aid in beef management decisions • Beef Feedlot Monitoring Program • computerized feedlot management and closeout analysis

  9. Beef Feedlot Ration Analysis (MCS-7) • Evaluates rations and projects performance for growing cattle • Calculates ADG, cost of gain, ration adequacy • Rations adjusted by trial and error

  10. Beef Cow Ration Analysis (MCS-13) • Evaluates ration for beef cow herds • Corrects for cow size, milk production, environment and condition

  11. Cowculator • OSU Beef Cow Ration Balancer • Similar to MCS-13

  12. Costs and Returns to Beef Cattle Feeding (MCS-14) • Evaluates feeding and purchase decisions in a budget format • Evaluates alternative feed prices, cattle types and weights, market price and risk, market timeliness and other factors on profitability

  13. Beef Feedlot Monitoring Program • Tracks performance and cost of individual pens of cattle • Aides in making mid-course corrections in feeding and management • Develops close-out analysis for comparison • Tracks feed inventory • Develops billings for custom-fed cattle

  14. Beef Management Software with Nutritional Components • Simulation Software • MCS-14 • Oklahoma State BEEFGAIN • Monitoring of performance • ISU Beef Feedlot Performance and Cost Monitoring

  15. TAURUS • Least cost ration formulation for beef cattle • Developed at University of California - Davis • Version 2.0 is latest version • Version 1.1 is on disk

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