This study shows that mushroom farming creates leftover substrate that can be turned into healthy animal feed through a fermentation process called ensiling. When mixed with corn and fermented, this mushroom waste creates nutritious silage for livestock that contains beneficial plant compounds called polyphenols. The best results came from silages containing 70% mushroom substrate mixed with 30% corn, which had good taste, smell, and digestibility. This approach demonstrates how agricultural waste can be recycled into valuable animal feed, supporting more sustainable farming practices.