A study was conducted to evaluate the effect of full fat soybean (FFSB) extruded at different temperatures on blood constituents, digestive organ weights, ileal digesta viscosity and performance of broiler chickens. Full fat soybeans were extruded (EFFSB) at 145°C, 155°C and 165°C for 15 s with high pressure and shear forces at a feed plant and used at the level of 150 g/kg in isocaloric and ionitrogenous starter, grower and finisher diets. One corn-soy diet was used as a control treatment with similar protein and energy. One hundred and 90 2d-old Ross 308 male, broiler chickens were allocated to 4 dietary treatments with 4 replicates of 12 birds each. Performance criteria were recorded weekly. Blood sample of one bird from each replicate was taken via wing vein and percentage of oxygen saturation (SO2%) measured with gasometric system on d 18. One bird from each replicate was slaughtered, digesta collected from ileum and digestive organs weighed on d 21. All data was analyzed using GLM procedure of SAS (9.1). The blood gasometry results showed that percentage of oxygen saturation (SO2%) and oxygen pressure (PO2, mmHg) in blood were similar in all chicks (P > 0.05) showing that extrusion temperatures did not affect oxygen saturation of chicks blood. There were not significant differences (P > 0.05) in body weight gain (BWG), feed intake (FI), feed conversion ratio (FCR) and production number (PN) of birds fed FFSB extruded at different temperatures. All digestive organs such as gizzard, proventriculus, small intestine, ceca, liver, pancreas and abdominal fat to live bird weight (P > 0.05) and ileal digesta viscosity were similar in all birds (P > 0.05). It is concluded that extrusion of FFSB (150 g/kg diet) at 145°C, 155°C and 165°C did not affect performance, blood constituents, digestive organ weights and ileal digesta viscosity of broiler chicks compared with birds fed corn-soybean meal diet.

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