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In order to increase understanding of the contribution of fodder legumes to the development of sustainable cattle farming, we based technical and economic analysis on data gathered from experimental sites situated in Blongko, South Minahasa Regency. The study aims to determine the effect of substitution for indigofera sp. replacing pennisetum purpureum cv. dwarf forage to beef cattle body weight gain. The study used twelve experimental beef cattle aged between 18-24 months consisting of three treatments with five replications each. Cattle are grouped randomly into forage treatment, which is the ratio of the percentage of composition between grass pennisetum purpureum cv. dwarf with legume indigofera sp. as follows: (R1) 100:0%; (R2) 60:40% and (R3) 40:60%. Feeding as much as ten percent of body weight based on fresh ingredients, or the equivalent of three percent of dry matter. Feeding twice a day, while drinking water is given ad libitum. The research was carried out in which cattle were given grass pennisetum purpureum cv. dwarf and legume indigofera sp. according to the design composition percentage, with a two-week research adaptation period, then data collection for three full months. The results of the study showed that the treatment of R2 gave the highest body weight gain of 0.506 kg / head / day, then (R3) 0.478 kg / head / day and the lowest (R1) 0.402 kg / head / day. It was concluded that (1) The results showed that feeding legume indigofera sp. replacing some grass can increase cattle weight gain, rather than just using grass; and (2) the substitution from grass pennisetum purpureum cv. dwarf with legume indigofera sp. with a ratio of 60:40 percent in beef cattle feed increased the body weight of beef cattle the highest.