A Brazilian research team evaluated the effect of replacing corn grain with crude glycerin on performance, carcass traits, and yield of commercial carcass cuts of beef bulls finished on feedlot. The glycerin source used was derived from soybean biodiesel production (84.41% glycerol, 6.94% fat, and 8.64% methanol). Thirty Nellore × Angus bulls were allocated to five treatments (0, 5, 10, 15 and 20%) of crude glycerol on diet dry weight basis. The glycerin was added by replacing finely ground corn in the concentrate. The animals were fed 13% crude protein diets containing 50% corn silage and 50% concentrate (dry matter basis). Results indicated no significant effects (P > 0.05) of increasing dietary levels of crude glycerin for most of the following measurements: average daily gain, dry matter intake, feed efficiency, carcass daily gain, subcutaneous fat thickness, rib eye area and dressing percentage. The researchers concluded that crude glycerin can be included up to 20% of the diet’s dry matter for beef bulls fed diets with roughage to concentrate ratio of 50:50 without compromising animal performance and/or carcass traits.