Use of statistical models to determine the optimal concentration of metabolizable energy for growth performance of broiler chickens

•Statistical models can be used to determine the optimal dietary concentration of metabolizable energy for broiler chickens.•Different regression models can lead to distinguished interpretations of dietary energy recommendations.•Quadratic polynomial regression model fit best the data in the grower phase for optimal feed conversion ratio (FCR).•Linear response plateau model best fit the data in the finisher phase for optimal FCR.