Abstract
Development, testing, and implementation of a computerized linear program for dairy rations is described. National Research Council feeding standards were integrated with functions of milk production and feed intake synthesized from various sources to produce a model for maximizing income above feed cost. Nutrient data for 101 feed ingredients are included in the program with options to modify the data or add data for additional feeds. Input data consist of cow weight, milk fat test, response of milk production, milk price, percentage of cows in first and second lactations in the group, prices on available feed ingredients, and minimum or maximum constraints on feed ingredients. An example of computer printout is illustrated, and results are presented from the program under commercial dairy conditions. The program can be accessed by remote computer terminals connecting with the central computer over telephone lines. Initial testing of the model with cooperators in the field was through the University of California–Davis Computer Center. Commercial use of the program by the dairy industry will be through the Dairy Records Centers processing Dairy Herd Improvement data.
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