The effect of replacing corn by crude glycerin (GB) on the performance and economic viability of beef cattle at pasture in the rainy season was evaluated. A total of 30 animals with average body weight (BW) of 238.6 ± 21.24 kg in a completely randomized design between treatments: mineral supplement and concentrate supplementation (1.0 kg/animal, 30% CP) with 0, 33, 66 and 100% of GB replacing corn. The supply of protein-energy supplements increased average daily gain (ADG) and final BW than those who received only mineral supplements. The increase in ADG was 0.200 kg/day. No effect of the levels replacement of corn on ADG that provided gains of 0.817, 1.042, 1.064 and 1.005, respectively, for 0, 33, 66 and 100%. The supply of 1.0 kg of protein-energy supplements containing 30% CP improves the performance of the pasture beef cattle during the wet, reducing the pasture occupation time compared to animals receiving only mineral supplementation. The crude glycerin can replace 100% of the corn in supplements offered in the proportion of 0.45% of BW without decrease animal performance. When the price of crude glycerin represent 54% of the price of corn to replace up to 66% of the corn showed to be economically viable.
biodiesel; performance; supplementation
