This study was conducted to evaluate the effect of feeding protected soybean fat and beta-adrenergic agonist Salbutamol on growth performance, nutrients digestibility and carcass characteristics of Iranian Bahmaei feedlot lambs. Twenty male lambs (mean age 90±7 days, mean weight of 29±1.7 kg) were used in a completely randomized design with four treatments (five replicates per treatment) for 80 days. The treatments were: Control (basal diet), F, experimental diet containing 5% protected soybean fat supplement, S, basal diet plus Salbutamol (4 mg/kg of DMI) and FS, experimental diet containing 5% protected soybean fat supplement and administration of Salbutamol (4 mg/kg of DMI). Treatments were similar in terms of energy, protein, NDF contents and forage to concentrate ratio. At the end of the experiment, the results showed that although feeding fat supplement increased fat and ash digestibility, but had no significant effect on body weight change, average daily gain and feed conversion ratio, DM, OM, NDF and ADF digestibility. Salbutamol did not affect lamb performance and nutrient digestibility however, improved carcass characteristics by increasing weight and percentage of thigh, shoulders, carcass without fat tail and decreased fat tail weight and percentage. Simultaneous use of fat supplement and beta agonist Salbutamol significantly increased weight and percentage of carcass tail fat and reduced carcass without tail fat weight compared to the control (P<0.05). Carcass weight and visceral components were not affected by treatments (P>0.05). Therefore, based on the results of this study, administration of Salbutamol (4 mg/kg of DMI) is recommended to improve carcass characteristics but simultaneous use of protected supplemental fat and beta agonist Salbutamol is not recommended. Keywords: Carcass characteristics, Lambs, Performance, Protected fat, SalbutamolTo cite this article: Forouzmand M, H Ghasemi and E Rowghani, 2016. Effect of feeding protected soybean fat supplement and Salbutamol administration on growth performance, nutrient digestibility and carcass characteristics of Iranian Bahmaei feedlot lambs. Res. Opin. Anim. Vet. Sci., 6(1): 7-12.