Three hundred broiler chicks, averaging 3 days of age and 69 g initial body weight, were used in a 42-day experiment to determine the effects of substituting meat and bone meal(MBM) and fish meal(FM) for soybean meal(SBM) and tricalcium phosphate(TCP) in diets for broiler chicks. Treatments were 1) SBM-TCP-based control, 2) 3% MBM, 3) 5% MBM, 4) 3.7% FM, and 5) 5% FM. These diets were formulated to 19% crude protein, 1% calcium, and .45% available phosphorus, and fed in mash form. Diets with 3% and 5% MBM had no effect on body weight gain compared to the control diet, but rate of gain was greatest for chicks fed the diet with 5% FM(P$lt;.05). Feed intake and feed efficiency were not affected by the diets(P$lt;.05). Retention of phosphorus in chicks fed the FM diets was improved compared to those fed MBM and the control diet(P$lt;.05). Bone breaking strength of the tibia tended to be greater for chicks fed the MBM and FM diets compared to the control diet. and diets with FM resulted in the greatest bone breaking strengths(P$lt;.05). Considering overall growth performance and bone measurements, MBM and FM are acceptable substitutes for SBM and TCP in diet, for broiler chicks.