The constant aim in animal production of the poultry industry is the improvement of the ratio between cost and profit of products in order to extract maximum productive efficiency in shorter periods of time. That said, the mathematical modeling is an essential tool in scientific research for better production planning that has the power to adjust to different economic, market and food demands. Therefore, the goal of this study is to evaluate the effect of electrolyte balance to optimize the performance of broilers supplemented with phytase, using the statistical method of analysis of central composite design (DCC). Thus, the experiment will use 130 male chicks one day old of Cobb 500 strain and the treatments will consist of diets with electrolyte balance of 250 mEq / kg and combinations of different levels of electrolyte ratio (RE) and phytase. The treatments will be conducted using the combinations of 0, 1000 and 2000 FTU / kg of phytase and 2.5; 3.0 and 3.5 of RE; these combinations will be made based on DCC. Will be measured performance data, weight gain, feed intake, feed conversion, carcass yield and percentage of abdominal fat as well as the feasibility of using the central composite design to optimize experiments with broiler and to adjust the response surfaces.
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