The objective of this study was to evaluated fermentation losses and silage quality with the addition of different by-products in TMR. A completely randomized design was used with four treatments: Control (CTL. with hay. corn silage. https://www.roneverhart.com/Western-Digital-Red-WD80EFZX-8TB-5-4K-RPM-SATA-6Gb-s-3-5-HDD/