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Doaguie, A.R., A. Ghazanfari, L.G. Tabil. 2012. Mesophilic anaerobic digestion of damask rose bagasse with different proportions of cattle manure. Canadian Biosystems Engineering/Le genie des biosystemes au Canada 54:8.1-8.6. The flowers of damask rose plants (Rosa damascena Mill.) are utilized in hydro-distillation industries to produce concentrated rose water and essential oils. Rose bagasse is the main byproduct of these industries that are conventionally used as compost. The objective of this research was to investigate the potential and the kinetics of biogas production from this bagasse mixed with cattle manure with mass proportions of 95, 90, 85 and 80%. The anaerobic digestion process was carried out at two temperatures of 35 and 45°C for 30 days of hydraulic retention time. The daily pH, biogas production and generated methane were measured. The results indicated that biogas production rate increased with increase in the proportion of cow manure and temperature. Maximum cumulative biogas yield was 0.427 and 0.369 m/kg of volatile solids in 45oC and 35oC, respectively. The volatile solids reductions in the various treatments ranged from 64.9 to 81.4%. The cumulative daily biogas yield for the treatments were modeled using a modified form of Gompertz equation with resulting R values greater than 0.94.