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Computer Formulation Observations and Caveats

Department of Poultry Science, Pennsylvania State University, University Park, PA 16802; Phone: (814) 863-0655; FAX: (814) 865-5691

Correspondence: William B. Roush

When formulating rations by linear programming, a technical assumption is made that the nutrient contents of ingredients are known exactly. Ignoring this assumption by making margin f safety adjustments for nutrient variability in linear programming databases can lead to unexpected results such as high cost rations, higher than requested nutrient amounts in the finished feed, and misleading nutrient levels in computer printouts. These problems can be overcome with stochastic non-linear programming which can be used for formulating rations with variable nutrient inputs.

Key Words: Feed formulation • linear programming • stochastic programming

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				W. B. Roush, J. Purswell, and S. L. Branton An Adjustable Nutrient Margin of Safety Comparison Using Linear and Stochastic Programming in an Excel Spreadsheet J. Appl. Poult. Res., January 1, 2007; 16(4): 514 - 520. [Abstract] [Full Text] [PDF]