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Maju Utomo farmer group and Ngudi Berkah livestock group in Wonorejo Village, Gondangrejo District, Karanganyar Regency, Central Java raise Simpo beef cattle fattening. The observation of the research team in both groups, that there was a decline in the performance of fattening production and low acceptance of innovation. For this reason, it is necessary to increase the weight gain of cows by applying the innovative supplementation of growth promoted concentrate for fattening their beef cattle. The purpose of the research is the application of innovation in the use of growth promoted concentrate for evaluating the performance of the Simpo cattle fattening productions and the acceptability of the application of innovative use of growth promoted concentrate in both groups. Research methods include instructional and dialogues through counselling program activities using FGD (Focus Group Discussion) techniques, evaluating progress in the level of knowledge and understanding of the material, training and making growth promoted concentrate, applying the use of growth promoted concentrate for fattening, monitoring and continuous evaluation. The research treatments were P1 = control feed (30% fermented rice straw + 70% basal concentrate) and P2 = P1 + 20% growth promoted concentrate. The research parameters are initial weight, final weight, weight gain, average daily gain, feed conversion ratio, feed efficiency, feed cost going and innovation acceptability. The research data were processed using the t-test variance analysis. The conclusion is to increase the production performance of fattening products using additional growth promoted concentrate. The acceptability of innovations in the application of growth promoted concentrate is influenced by factors of livestock experience, breeders age, number of cows, livelihoods and the outpouring of labour.