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Abstract. The use of feed additives can significantly improve the efficiency of animal production, including the possibility of feed cost reduction and alternative feed raw material use. The number and type of feed additives with different purpose are wide available and provide alternatives to users. However, there are obstacles faced by livestock owner whether feed additives chosen to fit according to their end target, as well as costs constrain. The challenges in the tropics such as in Indonesia are quite different especially after the government prohibit antibiotic growth promotor as feed additive. There have been many efforts to get the best material to replace this antibiotic growth promotor, but there is still no one that can replace it in terms of effectiveness and cost