Sweet potato residue (SPR) is a by-product of sweet potato juice widely produced in China. The high starch content, neutral detergent fiber (NDF), and vitamins in SPR suggest that it may potentially serve as ruminants feed (Zuo et al., 2018). However, its high moisture content promotes undesirable fermentation and deteriorates readily after being exposed to air. Preserve this by-product with other dry feeds as total mixed ration (TMR) is a suitable method to reduce undesirable fermentation and balance intake of diet (Hu et al., 2015). Furthermore, TMR preserved as silage exhibits improved aerobic stability than ensiled alone (Hu et al.,