Objective of this study was to evaluate the ingestive behavior, feed efficiency, and nutritional and physiological parameters of sheep that were fed diets based on byproducts from the processing of cashew. The experiment was conducted in a completely randomized design with a 4 × 2 factorial arrangement with four levels of inclusion (6 %, 11 %, 16 %, and 21 % of cashew byproduct) and two forms of processing—with chemical treatment (CT) and without chemical treatment (NCT). The interaction levels of inclusion of the byproduct of cashew versus chemical treatments was not (P>0.05) for the dry matter intake, consumption of organic matter. No effect was observed (P>0.05) for the intake of dry matter in function of the type of chemical treatment used in the byproduct of cashew. There was no effect of interaction (P0.05). The inclusion of the byproduct of cashew did not influence the behavioral parameters, intake and digestibility of the diets of sheep, being recommended to use up to the level of 21%.