The future of modern animal husbandry is strongly influenced by several important global issues: 1) 'One Health', 2) growing world population, and 3) climate change and environmental degradation. Although progress has already been made in recent decades, more will need to be done in the coming decade(s) to meet the goals set. For future-proof animal husbandry, it is necessary to work with healthy animals, which feel well and need (almost) no antibiotics, and convert raw materials into animal protein (meat, milk, eggs) as efficiently as possible. And preferably raw materials that humans do not want to and/or cannot consume, and raw materials with the lowest possible carbon footprint. Microbial fermentation of raw materials be-fore they are fed to animals, can play a decisive role in addressing the challenges mentioned above. The pur-pose of this article is to briefly describe microbial fermentation of raw materials and their effect on animal health and feed efficiency

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