In this experiment we have studied the bioproductives effects of energy-protein ratio at diferents levels of crude protein and metabolizabel energy, concerining whith broiler pulets and capons.The experiments was carried out on 80 fowls divided in four experimental groups ; (L1.1, L1.2, L1.3, and L1.3).In this experiment 40 subiects was capons and 40 was pullets.The used hybrid was Ross 308 because of his good versatility and productivity. The experiment was carried out in two phases of feeding program. First feeding stage was for gowing and begun at 54 days and was finished at 110 days. Second feeding stage was for finishing and begun at 111 days and finished at 130 days. At 84 days, we are proceeding for assessment slaughtering; therefore, we choose randomly 5 capons and 5 pullets for each groups. After slaughtering was made cutting by anatomical parts. Finaly was also carried out at slaughtering and cutting by anatomical parts.For all period we weighing all fowls and calculated feed conversion and mortality.