Abstract: A computerized monitoring system for animal feed ration processing mills equipped with proportioners including a console having a keypad and liquid crystal display screen, a processor board and a circuit board for monitoring proportioner flow rates. The system assists an operator in preparing precisely tailored animal feed rations by computing proportioner dial settings for a given ration, computing the analysis of a ration for % protein, % calcium, % phosphorous and % moisture, and tracking usage inventories of ration ingredients. Ration formulas may be interactively fine tuned by adjusting proportioner throughputs during ration preparation.