Feeding and metabolic trials were conducted to study effects of source and level of dietary phosphorus on the growth rate, nutrient utilizability, blood and bone mineral compositions of broiler chicks. Phosphorus sources used were monoammonium phosphate (MAP), bone meal (BM), dicalcium phosphate (DCP) and tricalcium phosphate (TCP). Dietary phosphorus levels were 0.3(VL), 0.5(L), 0.7(0), 0.9(H) and 1.1%(VH), which were achieved by adding different levels of DCP. Results obtained are summarized as follows: 1. Adding BM as a dietary phosphorus source resulted in slightly better growing performance and nutrient utilization without statistical significance. Dietary phosphorus did not influence, the levels of serum Ca and P. However, bone Ca and P levels in chicks fed BM were much higher (P$lt;0.05) than those fed other phosphorus sources. 2. Optimum level of dietary phosphorus (0.7%) gave the best result in growth rate, nutrient utilization and bone calcification. Extreme phosphorus levels (0.3% and 1.1%) resulted in poor growing performance and nutrient utilization when compared with other three medium levels of dietary phosphorus (0.5, 0.7 and 0.9%).