A corn based diet with 3200 kcallkg metabolizable energy and 12 percent crude protein was formulated and substituted\\\'with 0, 7.5and 15percent levelof each six samples of meat and bone meal from a local animal rendering plant. Each of thirteen experimental diets fed to 6 adult leghorn roosters in completely randomized design. AMEn values of experimental diets determined with total excreta collection method. AMEn content of each six sample of meat and bone meal was calculated by difference method. AMEnvalues of six meat and bone meal samples varied from 2033 to 3275 KcallKg in 7.5 and 15 percent level substitutions and did not show significantly differences(P<0.05)between two substitution levels. Ether extract was solely the best variable of predicting AMEn content of meat and bone meal but more accuracy estimation ofAMEn was resulted by including ether extract and gross energy in the model. The equation was as AMEn= -282 :I:326 + ,77:1:13ether extract + 0.357:1: 0.09 gross energy,R2=0.98,P=0.0029.Mean content of AMEn in meat and bone meal was 2865:1:275Kcal/Kg.The results showed that the studied meat and bone meal was rich of energy.

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