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This study aims to determine the supplementary effect of rice bran (RB) and mineral block (MB) on the forage-based diet on the growth performance and cost efficiency of Ongole Cross-bred bulls in smallholder farmers. This study used 30 heads of Ongole crossbred bulls with an initial body weight of 199.4±49.6 kg aged between 12 to 18 months owned by smallholder farmers located in Bawuran village, Pleret sub-district, Bantul regency, Yogyakarta region, Indonesia. The bulls were randomly divided into 3 treatments i.e., T0, T1, and T2 with 10 heads per treatment. T0 = current feeding system (CFS) ad libitum, T1 = CFS ad libitum+RB of 1% body weight (BW)/day+MB 1.1 kg/head for 9 weeks, and T2 = CFS ad libitum+RB of 2% BW/day+MB 1.1 kg/head for 9 weeks. The experiment was performed for 9 weeks from 31 July to 30 September 2019. Data analyzed by analysis of covariance and data significantly different analyzed by Least Significant Different test. The results found that supplementation of RB 1-2% BW/day and MB 1.1 kg/head for 9 weeks on Ongole crossbred bulls could increase the average daily gain (ADG) from 0.27 kg/head/day to 0.54−0.74 kg/head/day and increase income over feed cost (IOFC) from 1183 IDR/head to 7310−13226 IDR/head per day. It was concluded that the supplementation RB 2% BW/day and MB 1.1 kg/head for 9 weeks on a forage-based diet could improve the optimum growth performance of Ongole crossbred bulls and increase farmers' income. [ABSTRACT FROM AUTHOR]