Glicerina bruta em suplementos para bovinos de corte a pasto no período seco

Abstract

The objective of this work was to evaluate the effect of the replacement of corn by crude glycerin (CG) on the nutritional parameters and performance of beef cattle grazing Urochloa brizantha 'Marandu' during the dry season. To evaluate ruminal parameters, five non-fistulated Nelore steers were used, with average initial body weight (BW) of 331.7±29.6kg, allotted to a 5x5 Latin square. To evaluate performance, 30 steers were used, with average BW of 312.4±23.3kg, allotted to a completely randomized design. Concentrated supplements (20% crude protein) with 0, 33, 66, and 100% CG replacing corn were evaluated and provided in the amount of 4.0kg per animal per day. Intake of supplement, total, and pasture dry matter (DM), as well as of digestible organic matter (OM), presented quadratic behavior to the replacement levels. The apparent digestibility of DM, OM, neutral detergent fiber, and digestible OM, as well as average daily gain, also showed quadratic behavior. In concentrated supplements provided in the amount of 10g kg -1 body weight, the total replacement of corn by crude glycerin reduces supplement and digestible organic matter intake, besides the performance of grazing beef cattle.