In recent years, poultry meat production in Ukraine has increased. The main place belongs to broiler meat. Recent alternatives include known probiotics, prebiotics, enzymes, mananooligosaccharides, antioxidants, tranquilizers, bacteriostatics etc. This list we you can add Acidifiers which are composed of various acids and their salts to support increased acidity in the stomach, which contributes to the release of stomach juice and pancreatic enzymes. This, in turn, improves digestion and assimilation of nutrients. The purpose of the study is to investigate the effect of different doses Acidifier "FRA LBB DRY" in the fodder on productivity of broiler chickens. The experiments were carried out in vivarium of Bila Tserkva national agrarian university. Three analog groups of broiler chickens cross "Cobb-500" were formed at age of 3 days with 46 birds in each group.The first (control) group of broilers was fed with balanced complete feed according to the norms corresponding to age periods of growth. Chickens of the 2nd experimental group were fed with full-feed with addition of acidifier "FRA LBB DRY", at a dose of 3 kg/ton of feed, chickens of the 3rd experimental group received full-feed with addition of the acidifier at dose of 5 kg/t of feed. The addition of the acidifier to the feed had positive influence on survival of chicken broilers. In both experimental groups this index was higher than in control by 4.3%. The weight of chickens of the 2nd and the 3rd experimental groups at 42-day age was respectively 2409.4 and 2411.9 g vs. 2295.4 g in control. The total body weight increase was statically higher in experimental groups by 113,4-117.6 g and the cost of feed for 1 kg of growth was smaller than the control by 3.4%. The most objective indicator of economic evaluation of growing broiler chickens is the European index of efficiency, which in the experimental groups higher by 37.8-38.6 units than in control.