Microalgae are a heterogeneous group of photosynthetic aquatic plants that utilize atmospheric CO 2 andlight energy for their metabolic activities, producing a variety of essential nutrients such as proteins andamino acids Therefore, microalgae meal MM could be considered a sustainable alternative proteinsource to the widespread use of soybean meal in poultry diets The aim of this study was to evaluate thegrowth performance of broiler chickens fed diets with increasing dosages of MM Spirulina spp up to 22d of age in partial substitution of soybean and then a common commercial basal diet up to slaughter age