According to the researches results, the chickens within the experimental groups performed better values for the live weight gain and for the feed conversion rate, as compared to those in the control group. Economically speaking, the revenue was 2,30-7,35% higher in the E2 group, which yield the best production parameters (highest live weight and lowest FCR), than those obtained by the chickens in the other studied groups.The best performances, considering all the parameters, were observed in E2 group, which received a concentration of 500 g feed additive (LB)/tone of mixed fodder, in order to improve the lipids absorption rate in chickens gut.