Feeding condensed distillers solubles to feedlot finishing steers and the effects of feed additives in adaptation diets

摘要: Performance and carcass characteristics were evaluated using five concentrations of condensed corn distillers solubles (CCDS) replacing steam-flaked (SFC) urea in finishing diets crossbred steers (initial BW = 399 ± 27 kg). Concentrations CCDS were: 0, 9, 18, 27, or 36% on a DM basis. Urea soybean meal included all to meet exceed NRC requirements for metabolizable protein. Steers utilized randomized block design, blocked by BW, stratified within block, assigned randomly pens. Pens treatment with 8 pens/treatment 11 steers/pen. fed an average 97 d. Dry matter intake decreased quadratically (P < 0.01) as the concentration increased diet. Average daily gain greatest gains observed at 27%. Similar ADG, G:F 0.01), 27% before decreasing CCDS. Hot weight also maximized Calculated YG marbling score 0.06 0.08, respectively). Fat thickness LM area tended 0.13 0.07, respectively) increase Additionally, diet, dressing percentage linearly 0.01). Based first derivative quadratic response, was calculated be 18.2% 24.5% maximizing ADG G:F, respectively. Feeding can effectively used replace SFC feedlot while improving G:F.