Анотация: The study evaluates the effects of the prebiotic ` Actigenо ` on the growth and development of ROSS broilers and the possibility to exclude antibiotics during the fattening period. To this end, 4 groups of male broiler chickens were formed: Group T1 - con/style> ;

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®?§trol group, fed standard feed, but water was supplemented with antibiotic; Group Т2 - broilers received nothing but the standard feed, while water was not supplemented with an antibiotic; Group Т3 - the feed of broilers was supplemented with a prebiotic ( Actigenо ) at 800 g/t in starter, 400 g/t in grower, 200 g/t in finisher, and water was supplemented with an antibiotic; Group Т4 - feed of broilers was supplemented with prebiotic ( Actigenо ) at 800 g/t in starter, 400 g/t in grower, 200 g/t in finisher, whereas water was not supplemented with an antibiotic. It was found that during the first feeding phase, birds from groups Т1, Т3 and Т4 had a statistically significantly higher weight gain compared to group Т2. During the second phase, broilers from group Т2 preserved the considerably lower weight gain, whereas during the third stage of feeding, group Т3 demonstrated statistically significantly higher weight gain than both groups Т1 and Т2 ( P < 0.05 ), hence the higher live weight gain of broilers from group Т3 by the end of the experiment ( P < 0.05 ). The best FCE ( feed conversion efficiency ) was established in groups Т3 - Actigenо + antibiotic; Т4 - Actigenо ( without antibiotic ) - 1.944 kg feed/kg gain and 2.059 kg feed/kg gain respectively. Data for mortality rate during the rearing period showed that no birds from group T4, supplemented with Actigenо but not supplemented with an antibiotic, have died. Highest mortality occurred in groups Т1 and Т2 - 8.7 percent, whereas the mortality rate in group Т3 - Actigenо + antibiotic was 4.35 percent. Calculated EPEF was highest in group Т3 - 299 and Т4 - 280. In conclusion, chickens whose feed was supplemented with a prebiotic, had a higher final live weight, showed better feed conversion efficiency and higher European poultry efficiency factor ( EPEF )