This research was conducted to evaluate the performance, metabolizability of nutrients and yield of carcass and the most commercial cuts of broiler chickens fed with diets containing antibiotic growth promoter, probiotics, prebiotic and symbiotics, in the period from 22 to 42 days of age. The experimental treatments were constituted of the basal diet to attempt the nutritional requirements of birds in each phase and others treatments were added of antibiotic; probiotics; prebiotic and symbiotics. The use of probiotic (Lactobacillus acidophilus, Streptococcus faecium and Bifidumbacterium bifidum), and prebiotic (mananoligossacarídeo-MOS) and symbiotics in ration of broiler chicken feed, produce performance, carcass yield and yield of most of the commercial cuts (breast, back, thigh, drumstick, wings and wing drumette), as well as metabolizability coefficient of dry matter, crude protein and gross energy, similar to that achieved with the use of the antibiotic Avilamycin 12%, during the period from 22 to 42 days of age. This way, these additives are important alternative in the substitution of antibiotics.
dry matter; gross energy; birds