Metabolizable energy (M.E.) and metabolizable energy corrected to nitrogen equilibrium (M.E.n) were determined for raw and autoclaved samples of four grain legumes, seven oilseed meals and five animal protein concentrates, using 9-day old White Leghorn cockerels. The M.E. and M.E.n for the autoclaved legumes were superior to the raw, the improvement with autoclaving being most marked for bambara nut. Acacia seed had the least M.E. and M.E.n values among the legumes probably related to its high crude fibre content. The oilseed meals had M.E. and M.E.n values lower than for the autoclaved grain legumes, similar values being obtained for soybean, Sesame and palm kernel meals and slightly higher values for groundnut. Distinctly lower values were obtained for coconut and cotton seed meals. Raw and autoclaved rubber seed had M.E. and M.E.n values of 4.96 ± 0.29 and 4.83 ± 0.08 and 4.58 ± 0.16 and 4.63 ± 0.12 respectively, which were significantly higher than the corresponding values of 2.46 ± 0.37 and 2.38 ± 0.04 for the defatted rubber seed meal, due to its much lower oil content. Among the animal proteins concentrates, the M.E. and M.E.n for blood meal (3.49 ± 03 and 3.44 ± 0.03), were higher than for white fish meal (274 ± 0.13 and 2.63 ± 0.07), Menhaden fish meal (2.86 ± 0.05 and 2.74 ± 0.12) and an unspecified fish meal sample (2.47 ± 0.24 and 2.22 ± 0.17). Meat and bone meal, had the least M.E. and M.E.n values (2.14 ± 0.11 and 2.02 ± 0.08 respectively). The variable M.E. values for the fish meals did not appear to be related to variation in oil content but may be due to reduced availability of nutrients resulting from poor or long storage.