The nutritional value of Tenninalia catappa seed as a source of dietaly protein was investigated. The crude protein content of the seed was high (25.81 %). The amino acid analysis showed a goodpattem of the essential amino acids (EAA) (in g/16 g N) -leucine (7.32). isoleucine (3.58), valine (2.74), phenylalanine (3.04). tryptophan (0.9), methionine (1.48), lysine (3.39), threonine {2.94), histidine (2.96). Tyrosine (2.12) is the limiting amino acid. The protein quality of the seed was evaluated by in vivo bioassays using weanling male Sprague Dawley rats (50-60 g). The indices of protein quality measured include PER, BV, NPU and lD. There were positive correlation between PER and BV (r = 0.7105). PER and body weight gain (r = 0.9157), PER and nitrogen intake (r = 0.7428). The results showed that T. catappa seed protein has a good pattern of the EAA. is highly digestible, can support growth and positive nitrogen balance and thus has a high dietary protein quality.
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