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چکیده
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Objectives: Due to the limitation of raw materials required for production of inorganic dicalcium phosphate (DCP) in Iran, the amount of production of this material has decreased and therefore its price has increased. To solve this problem, it is possible to use organic DCP, which is a byproduct of gelatin production. Of course, before it is possible to recommend organic DCP to poultry feed producers, it is necessary to measure this issue scientifically. Therefore, the aim of this research was to compare the effect of DCP with inorganic and organic source on performance of broiler chickens. Materials & Methods: The experiment was conducted with 280 one-day-old male broiler chicks of Ross 308 in a completely randomized design with 7 treatments, 4 replicates and 10 observations per replicate for 35 days. Phosphorus from two sources of phosphorus supply (DCP with inorganic and organic sources), at three levels (0.15, 0.30 and 0.45), added to basal diet containing 0.15 phosphorus. Body weight and feed consumption by birds were measured at 7, 14, 21, 28 and 35 days, and feed conversion ratio was calculated. At the end of experiment, two birds per replicate were randomly selected for slaughter. Carcass weight, breast muscle and thighs were measured and relative weight of carcass components was calculated. The collected data were statistically analyzed by SAS software and GLM procedure. Duncan's test was used to compare the differences between means. Results & Conclusion: Mortality of chickens consumed basal diet were more than diets containing 0.15, 0.30 and 0.45% available phosphorus (P<0.05). The lighter body weight and less feed consumption of chickens received basal diet compared to experimental treatments were visible since end of second week (P<0.05). Also, at the end of 35 days, chickens fed basal diet had lower carcass percentage and relative breast weight than experimental treatments (P<0.05). Considering that no significant difference was seen between performanc
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