0
Three experiments were conducted to evaluate a novel source of high-protein distillers dried grains (HP-DDG) fed to growing pigs. The standardized ileal digestibility (SID) of AA in HP-DDG and in soybean meal (SBM) was determined in Exp. 1. Nine pigs (109.8 ± 2.78 kg of BW) were fitted with a T-cannula in the distal ileum and allotted to a triplicated 3 × 3 Latin square design with 3 diets and 3 periods per square. Diets containing HP-DDG or SBM as the only source of AA and an N-free diet were formulated. The SID of indispensable AA was less (P < 0.01) in HPDDG than in SBM (Arg, 87.5 vs. 93.9%; His, 76.7 vs. 88.7%; Ile, 76.4 vs. 87.5%; Leu, 77.8 vs. 86.8%; Lys, 75.4 vs. 88.4%; Met, 82.8 vs. 88.4%; Phe, 77.9 vs. 87.3%; Thr, 72.5 vs. 83.5%; Trp, 85.1 vs. 91.0%; Val, 73.3 vs. 84.3%). The DE and ME in HP-DDG and in corn were measured in Exp. 2 using 16 growing barrows (24.6 ± 1.66 kg of BW). A corn-based diet and a diet containing 50% corn and 48.2% HP-DDG were formulated. The total collection method and the difference procedures were used. The concentrations of DE and ME in HP-DDG were greater (P < 0.001) than in corn (5,043 vs. 4,002 kcal/kg of DM and 4,690 vs. 3,921 kcal/kg of DM, respectively). Experiment 3 was a 9-wk growth assay using 40 pigs (initial BW: 58.2 ± 2.28 kg) allotted to 5 dietary treatments, with 8 replicates of individually housed pigs per treatment. Treatments included a control diet based on corn and SBM and 4 diets in which HP-DDG replaced 33, 66, 66, or 100% of the SBM in the control diet. All HPDDG diets contained supplemental Lys and Thr to provide similar concentrations of SID Lys and Thr in all diets; one of the diets in which HP-DDG replaced 66% of the SBM and the diet in which HPDDG replaced 100% of the SBM also contained crystalline Trp.
Dietary treatments had no effect on ADG (1.15, 1.13, 1.16, 1.12, and 1.14 kg), ADFI (3.33, 3.35, 3.39, 3.30, and 3.33 kg), or G:F (0.35, 0.34, 0.34, 0.34, and 0.34 kg/kg). Carcass traits of pigs fed the diet in which HP-DDG replaced 100% of the SBM were not different from those of pigs fed the control diet. In conclusion, HP-DDG contains more DE and ME than corn, but has decreased SID values for AA compared with SBM.
Soybean meal can be replaced by HP-DDG in diets fed to finishing pigs without any effect on growth performance or carcass characteristics, provided that diets are adequate in indispensable AA.
BG Kim, GI Petersen, RB Hinson, GL Allee, and HH Stein, 2009. Journal of Animal Science. 87:4013. http://dx.doi.org /10.2527/jas.2009-2060