Titulo en ingles: Probiotic potential of native strains, for as feed additives for poultry Resumen: Se evaluo in vitro el potencial probiotico de cepas nativas aisladas de las heces de pollos asilvestrados ( Gallus gallus) pertenecientes a los generos Lactobacillus sp, Bacillus sp y levaduras tipo saccharomyces sp ; se determino la actividad probiotica mediante pruebas de resistencia al acido (pH 3, 4, 5, 6, 7), sales de bilis (0,05, 0,1, 0,15, 0.3 %), tolerancia al NaCl (2, 4, 7, 10 %), actividad antagonica ( Salmonella sp , E. coli ), determinacion del tipo de fermentacion, crecimiento a temperaturas (28,37,43°C) y capacidad de crecimiento. Las cepas con mayor tolerancia se identificaron a traves de pruebas bioquimicas y fermentacion de carbohidratos. Como resultado se observo que tres microorganismos: Saccharomyces sp. (3), Bacillus sp. (7) y Lactobacillus sp. (14) poseen propiedades probioticas. Palabras claves: Gallus gallus; Saccharomyces sp. ; Bacillus sp.; Lactobacillus sp.; aditivos microbianos. Abstract: Was evaluated in vitro the probiotic potential of native strains isolated from feces of wild chickens ( Gallus gallus ) belonging to the genera Lactobacillus sp., Bacillus sp. and Saccharomyces ; probiotic activity was determined by testing acid resistance (pH 3, 4, 5.6, 7), bile salts (0,05, 0,1, 0,15, 0,3%), tolerance to NaCl (2, 4, 7,10%), antagonistic activity ( Salmonella spp, E. coli ), production gas (glucose), growth temperatures (28, 37, 43 ° C) and growth capacity. The most tolerant strains were identified by biochemical tests and carbohydrate fermentation. As a result it was found that three microorganisms: Saccharomyces sp. (3), Bacillus sp. (7) and Lactobacillus sp. (14) have probiotic properties. Key words: Gallus gallus; Saccharomyces sp.; Bacillus sp.; Lactobacillus sp.; microbial additives .