Abstract: This work was undertaken to assess the effect of quantitative substitution of cooked Mucuna utilis Seed Meal (CMSM) for soyabean meal in broiler finisher ration. Seventy-five; 4-week-old Anak broiler birds were used in this trial. The birds were divided into five treatments groups of 15 birds each in a Completely Randomized Design (CRD).The treatments had soyabean meal quantitatively substituted at 0, 22.42% (5%),44.84% (10), 67.26 (15%) and 89.68 (20%) respectively by cooked Mucuna utilis Seed Meal (CMSM). There were significant (P< 0.05) differences between treatment means for feed intake, weight gain and feed conversion ratio. They decreased as the dietary levels of Mucuna utilis inclusion increased in the diet. The cost /kg weight gain for test diets were significantly (P< 0.05) better than that of control diet. Cut-parts and organ proportions presented as a percentage dressed weight showed no significant (P>0.05) differences. Considering the lower feed conversion ratio for all (CMSM) diets, favourably comparable market weight of the birds fed (CMSM) even at 20% dietary level of inclusion, good cut-parts and organ weights and better cost per Kg weight gain of the test diets, 20% dietary level of substitution (CMSM) for soyabean meal is recommended in broiler finisher ration.