ISSUE FOCUS FEED & ADDITIVE MAGAZINE April 2025 43 Soybean meal P = Item BW, kg d 0 d 56 d 112 d 0 to 56 ADG, kg ADFI, kg F/G d 56 to 112 ADG, kg ADFI, kg F/G d 0 to 112 ADG, kg ADFI, kg F/G Caloric efficiency, kcal/kg gain Carcass performance Carcass ADG, kg2 Carcass F/G3 Carcass CE, kcal/kg gain Carcass characteristics HCW, kg Carcass yield, %4 Backfat depth, mm5 Loin depth, mm5 Lean, %5 Removals, % Mortality, % Total removals and mortality, % Low 28.8 80.8 132.7 0.925 2.014 2.18 0.975 2.953 3.03 0.948 2.463 2.60 6541 0.699 3.52 8854 98.2 73.9 17.0 68.3 56.8 3.8 1.1 4.8 Med-Low 28.8 80.4 131.8 0.916 2.000 2.18 0.957 2.939 3.07 0.934 2.440 2.61 6517 0.689 3.54 8836 97.5 73.8 16.3 68.3 57.1 5.4 2.4 7.7 SEM 0.467 0.844 1.025 0.009 0.003 0.019 0.010 0.003 0.021 0.008 0.003 0.016 39.9 0.006 0.022 11.16 0.771 0.15 0.28 0.51 0.17 1.14 0.71 1.40 Med-High 28.8 79.4 130.5 0.894 1.955 2.18 0.962 2.907 3.04 0.925 2.409 2.60 6453 0.680 3.53 8757 96.5 73.7 16.0 68.1 57.2 6.7 0.6 7.1 Linear 0.996 < 0.001 0.004 < 0.001 < 0.001 0.666 0.099 0.474 0.050 0.001 0.004 0.249 0.003 < 0.001 0.016 0.146 < 0.001 0.001 0.094 0.663 0.250 0.021 0.410 0.008 High 28.8 79.5 130.3 0.898 1.95 2.17 0.953 2.939 3.09 0.921 2.413 2.62 6446 1.49 3.57 8799 95.8 73.3 16.5 68.1 57.0 6.7 2.8 9.3 Quadratic 0.996 0.380 0.632 0.446 0.689 0.608 0.745 0.410 0.686 0.492 0.353 0.823 0.751 0.750 0.467 0.423 0.957 0.226 0.012 0.756 0.039 0.314 0.300 0.517 Table 3. Effects of increasing soybean meal on growth performance and caloric efficiency relative to corn and feed-grade amino acids1 1A total of 2,153 pigs (PIC 337 × 1050; initially 63.6 ± 1.03 lb BW) were used in a 112-d growth study with 26 to 27 pigs per pen and 20 replicates per treatment across two barns. 2Carcass ADG = overall ADG × carcass yield. 3Carcass F/G = ADFI / carcass ADG. 4Carcass yield was calculated based on adjusted live weight. Adjusted live weight = (pen live weight – total weight of light and cull pigs) / (pen inventory – number of light and cull pigs). 5Data were analyzed using HCW as a covariate.
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