The present study aimed to evaluate the effect of feed form (pelleted versus mash diets) and probiotic levels on growth performance, carcass traits, some blood parameters and nutrients digestibility of Ross broiler chicks during 42 days experimental period. One hundred and twenty, one day old Ross broiler chicks were randomly distributed into eighth treatments. Each treatment consisted of three replicates of 5 birds each. Both mash and pellet diet groups were subdivided into four treatment groups each. Each fed form supplemented with 0, 1, 1.5 and 2 g probiotic /kg diet, respectively. The obtained data showed that at 3 and 6 weeks of age, broilers fed a pellet diet had considerably higher body weight, weight gain, feed intake, and feed conversion ratio than those fed a mash diet. The ultimate BW and BWG, FI, and FCR of the birds fed the 1g or 1.5g probiotic/kg diets were considerably greater than those fed the 2g probiotic diet and the control diet. The addition of probiotics to the food or feed form of broilers at doses of 1, 1.5, and 2 g/kg had no effect on the carcass and blood parameters. When fed a mash meal instead of a pellet diet, the dry matter and protein digestibility values improved.  It can be concluded that fed pellet-diet with the supplementation of 1 and 1.5 g probiotic/kg diet improved productive performance but had no consistent effect on overall carcass traits and blood parameters of broilers chicks.