This is the R script (DLM_script.R) to characterize the evolution of the energetic allocation factor (αt) which represents the link between the cumulative net energy available (estimated from feed intake) and cumulative weight gain during fattening period. The data for the 100 fattening pigs are stored in the csv file (DataAxiom.csv) and structured as follows: ID: pig identification number; Fattening_group.Pen : fattening group and pen number for a given ID; t (day): time in days since the transfer to fattening room; Wt (kg) : median weight in kg at day t for a given ID; FIt (kg day-1) : total feed intake in kg at day t for a given ID. For detail description of the procedure please see article.