143 Impact of Replacing Soybean Meal with Corn DDGS and Crystalline Amino Acids on Performance and Carcass Characteristics of Growing Pigs

Abstract

Abstract This study evaluated the effect of replacing soybean meal (SBM) with DDGS and crystalline amino acids on growth and carcass lean. Pigs (n = 512; 38.51±0.13 kg BW) were blocked by BW and sex and placed in 64 pens (4 gilts and barrows per pen). Treatments were arranged as a 2×4 factorial with DDGS included at 0 or 25% and L-lysine-HCl (LYS) added at 0, 0.2, 0.4, and 0.6%. Dietary SBM inclusion declined as LYS increased from 32.06 to 13.14% (Phase 1) and 28.25 to 9.40% (Phase 2) for control diets. It declined from 27.85 to 8.89% (Phase 1) and 24.05 to 5.10% (Phase 2) for DDGS diets. Diets contained 1.00 (Phase 1, 21 days) and 0.90% (Phase 2, 18 days) SID lysine and were balanced for ideal protein and net energy. During Phase 1, DDGS decreased ADG (P = 0.06; 786 vs. 821 g/d). Increasing LYS increased (quadratic, P ≤ 0.05) ADG and ADFI with the greatest response at 0.4% LYS. G:F decreased (linear, P = 0.035) with increasing LYS. During Phase 2, increasing LYS in control, but not DDGS diets, decreased (linear, P < 0.005) ADG and ADFI. G:F declined (P = 0.054) with DDGS inclusion (370 vs. 383 g/kg). Overall, ADG decreased (linear, P = 0.005) as LYS increased in control (959, 929, 908, 860 g/d), but not DDGS diets (863, 908, 931, 832 g/d). ADFI decreased (linear, P = 0.014) with increasing LYS in control (2270, 2198, 2186, 2130 g/d), but increased (quadratic, P = 0.039) in DDGS diets (2112, 2207, 2324, 2103 g/d). DDGS reduced (P≤0.03) ADG (883 vs. 914 g/d), G:F (405 vs. 417 g/kg) and LEA (34.5 vs. 35.3 cm2), while increasing LYS decreased (linear, P < 0.005) G:F (417, 419, 409, 401 g/kg) and LEA (35.34, 35.17, 35.46, 33.64 cm2). Displacement of SBM with DDGS reduced growth and LYS addition negatively affected growth and G:F for diets with SBM, but not DDGS.