| Summary: | The main objective of this study concerns the bioconversion of industrial hemp extract residues (IHER) by applying a solid-state fermentation (SSF) bioprocess as a means to upgrade their nutritional composition, targeting their utilization as a proteinaceous animal feed. For this purpose, IHER underwent an SSF procedure initiated by <i>P. ostreatus</i>, and the results indicated that crude proteins were increased by 53.05%. Additionally, a similar pattern was observed concerning cellulose content, which was found to be increased by 5.25%, while lignin concentration exceeded a 2-fold increment. Furthermore, IHER afforded an increased β-glucan content of approximately 32.51%. These results revealed the significant potential of IHER as a supplement in animal diets after nutritional enhancement via SSF. This study contributes to the concept of the circular economy, thus promoting the reuse of agro-industrial wastes such as IHER in order to produce high-added-value products such as proteinaceous animal feed.
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