This review of the literature reveals the potential nutritional waste and by-products of coffee farming. Indeed, waste and by-products of coffee generally contains 10% of crude protein, 37% of crude fiber and minerals such as Ca and P. Used in animal feed, waste and by-products of coffee have ruminants, pigs, fish and chicken good animal performance at respective rates of use of 10-30%, 10-24%, 13-30% and 2.5-5%, without affecting their physiology and health. But caffeine and tannins (2-4.5%) associated with the alkaloids contained in these foods limit their ingestion in large quantities as affecting the health of animals and reducing the palatability of the plans. However, drying, silage, physical (percolation), chemical (alcohol extraction) or microbiological (fermentation with Aspergillus niger) methods contribute to reduce levels of caffeine and tannins of waste and by-products of coffee.
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