The first experiment has been done to detrmine the metabolizable enrgy value of rubber seed powder and comparing its value for ducks and chickens. Five local Indonesian seed powder and comparing its value for ducks and chickens. Five local Indonesian female ducks and five female chickens were used in the experiment. The metabolizble energy was used to formulate ration for feeding trial in 48 ducks and 48 chickens at 2-8 weeks age. The second experiment was to study the responsibility of rubber seed level (0, 5, 10, 15 percent) in the ration. The completely random design was used in the experiment with 2x4 factorial experiment. The first factor ducks and chickens species (S) and the second factor was ration that used four level rubber seed powder 0, 5, 10, 15 percent (R) in the ration. The result of the experiment based on the observation and statistical test can be concluded that: there is no interaction between species and rubber seed powder level, but species significantly affected to feed conversion, feed consumpation and the average weekly weightgain. The best consumption and conversion of ration were R3 (15 percent rubber seed powder level) treatment.