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¹ Ankara University, Faculty of Veterinary Medicine Department of Animal Nutrition and Nutritional Disease, 06110 Ankara, Türkiye DOI : 10.34233/jpr.738911 - The aim of this study was to determine the prececal phosphorus (P) digestibility of dicalcium phosphate (DCP) and monocalcium phosphate (MCP) for broiler using the linear regression method. A total of 360-d-old male Ross 308 broilers were raised until 20 days of age with a standard commercial starter diet (metabolizable energy, 3000 kcal/kg, crude protein, 22%, Ca 0.9%, P 0.6%). On 21 days of age all birds were weighed and assigned to 5 experimental treatment groups with 6 replicate cages each consisted of 12 birds. Each P source was included at two levels (to achieve increments of 0.075% and 0.15%) to the basal diet. Titanium dioxide was included at 0.5% in all diets as indigestible marker. On day 28, all birds were sacrificed and ileal digesta were collected. The prececal P digestibility of DCP and MCP were calculated by the linear regression to be 76.60% and 85.83%, respectively. The present results suggest that the P digestibility of the P sources should be considered when formulating broiler diets to achieve optimum dietary P concentrations without increasing diet cost and environmental pollution from P excretion. Keywords : Dicalcium Phosphate Monocalcium Phosphate Prececal digestibility Phosphorus Broiler