Total mixed ration silage made by mixing the wet by-products with roughage is in practice at farms in many countries because most food by-products have a high moisture content (Cazzato et al., 2011). This also helps to omit the time of mixing before feeding, minimizes the risk of effluent production and avoids self-selection of feeds by animals (Wang and Nishino, 2008). In addition, unpalatable by-products could possibly be incorporated into a total mixed ration if their odors and flavors were altered by silage fermentation (Xu et al., 2007b).