The effect of a probiotic formula containing a consortium of actinomycetes on the productive performance and intestinal integrity of broiler chickens from 1 to 28 days of age reared in experimental batteries was evaluated. A total of 320 male Cobb 500 chickens were used, randomly distributed in four treatments with eight repetitions and ten chickens per repetition: T1, basal diet (without growth promoters); T2, basal diet + growth promoters (tylosin 200 g/t, salinomycin + nicarbazin 500 g/t); T3, basal diet + Bacillus subtilis (100 g/t); T4, basal diet + actinomycetes consortium (100 g/t). At 21 and 28 days of age, eight birds per treatment were slaughtered to assess intestinal integrity (intestinal histomorphometry) and relative organ weight. At 14 days of age, the actinomycetes consortium significantly improved feed conversion versus the group receiving a basal diet (p<0.05) and had...