An experiment was conducted to assess effects of dietary corn silage (CS) replaced with sorghum silage (SS) on chemical composition, nutrient digestibility, product costs and performance of growing Steers. Thirty two steers (182.3 ± 5 kg BW) allocated in 4 treatments of 8 replicates based on a CRD. A diet including 60% hay (experimental part) plus 40% concentrate were fed to steers for a period of 120 day. Hay included 40% of the same grass silage + 60% of different levels of SS and or CS, alone or in combination. SS was replaced with CS in steer rations with ratios of 0, 33, 66 and 100% (T1-T4, respectively). Dietary CS replacement with SS significantly improved performance traits (P > 0.05). Crud protein (CP) and DM digestibility of sorghum forage and silage were significantly (P > 0.05) lower than corn, while NDF, ADF and Ash values were significantly higher in corn in compared to sorghum. The rumen DMD was significantly decreased and instead DMD rate of small and large intestine increased. It is concluded that, sorghum silage can be replaced in hay portion of diet up to 66 and or 100 % for better utilization of performance accompanying with an economic advantage in product expenses.
