We hypothesized that a log-linear model could be used to predict and evalua te the response of chicks to a dietary enzyme supplementation and that an in vitro dietary viscosity assay could be used in conjunction with the model as the predictor or evaluator. The results demonstrated that the model was able to accurately predict the response of chicks fed diets containing the different amounts of an enzyme and different proportions of t wo cereals. The slope of the model was a measure of the efficacy of the feed enzyme. The efficacy, in turn, was able to correctly evaluate the effects of different feed enzymes when added to a diet and to identify the most suitable target cereal for an enzyme. No other model, as f ar as the authors are aware of, are able to achieve this accuracy. In addition, a Multi-purpose Enzyme Analyzer has been developed based on the model. The analyzer was able to determine the optimal amount of an enzyme and a substituted cereal that should be used in a diet for maximal profit, and to de
