The dearness of the protein sources usable in the modern avicolous food remains a major challenge to raise in the developing countries. The oil cake cabbage tree available in RD Congo, contains 15 16 % of rough protein with a degradability from 40 to 50%. In this work, on the one hand, its effectiveness (To evaluate on the performances of the animals: Food consumption, Daily Average Profit and Index of consumption); in addition the output (To determine price of kg of food, production cost per Weight Live, gross profit). Four batches of 18 chicks of 10 days of age were nourished with the rations containing oil cake of cabbage tree 0 % (Pilot), 5% (T1), 10 % (T2) and 15 % (T3). Food Consumption was of 175,07 ±3,28g (Pilot), 166,93 ±17,96g (T1);171,70 ±11,53g (T2);175,47±10,48g (T2). Ponderal growth of 62,085 ± 3,84g (Pilot);58,502 ± 8,7g (T1);60,887±4,3g (T2) and 57,806 ± 4,918g(T3).The indices of consumption were of 2,8, similar for (Witness), (T1) and (T2);from 3 for (T3).The output calculated (in FC), the price of production of kg of food was 1465, 73 (Witness);1413,55 (T1);1342,75 (T2);1289,733(T3) and the gross profit of the experimental rations compared to the witness was 146,1 (T1);344,34 (T2) and 220,8 (T3). The output calculated (In FC), the price of production of kg of food was 1465, 73 (Witness);1413,55 (T1);1342,75 (T2);1289,733(T3) and the gross profit of the experimental rations compared to the witness was 146,1 (T1);344,34 (T2) and 220,8 (T3).No significant effect was induced by the various rates of substitution, on the other hand, an identical growth and an acceptable production cost per kg of live weight.