The trial had aimed to assess the place of growth promoters by organic additives based on herbal extracts (Castanea sativa + Acacia mearnsii) and butyric acid on the growth performance, cost/Kg and histology of the intestinal mucosa of broiler chicks. It was conducted in West Santa Catarina State University, with 600 male Cobb chickens, distributed in a ramdomized design in five treatments, eight repetitions and fifteen animals each. Was evaluated a blend containing 60% of herbal extracts and 40% of sodium butyrate. The treatments were distributed in T1-positive control (30 ppm halquinol), T2-negative control (no additives), T3-negative control + 300 ppm of organic additives, T4-negative control + 600 ppm of organic additives, T5-negative control + 1200 ppm of organic additives. All birds were fed with anticoccidian (monensin + salinomycin) from 1 to 35 days old. The results showed improving (P<0.05) on live weight, weight gain, feed intake and feed conversion ratio in bird fed with de blends and halquinol, in comparison of broilers fed no additives, in 1 to 21 and 1 to 42 days of age. There were better production efficiency index (P<0.05) and cost/kg produced in birds fed all additives than birds fed no growth promoters. The compounds tested can replace the growth promoters in chicken production, without affecting the performance and intestinal quality.