Effects of Standardized Ileal Digestible Lysine on Growth Performance and Economic Return of 108 to 178 lb Grow-Finish Pigs

A total of 2,124 barrows and gilts (PIC 1050 × DNA 600; initially 107.9 ± 1.31 lb) were used in a 32-d study to determine the optimal level dietary standardized ileal digestibility (SID) Lys for 108 178 lb pigs commercial setting. Pigs randomly allotted 1 5 treatments with 24 27 per pen 16 replications treatment. similar number placed each pen. Diets fed over 3 phases (108 129, 129 156, 156 lb, respectively). Dietary corn-soybean meal-based contained 10% (phase 2) or 5% 3) DDGS. formulated 85, 95, 103, 110, 120% 2016 PIC SID gilt recommendations as follows: phase levels 0.90, 1.01, 1.09, 1.17 1.27%; 2 0.79, 0.87, 0.94, 1.03, 1.10%; 0.71, 0.78, 0.85, 0.92, 0.99%, respectively. Overall (d 0 32), increasing increased (linear, P < 0.001) ADG, final body weight, intake/d, intake/kg gain an improvement F/G (quadratic, = 0.047). Additionally, feed cost pig, gain, revenue income (IOFC) ≤ 0.002) increased. Projecting IOFC, broken line linear quadratic polynomial models estimated maximum IOFC at 105.8% 113.7% Lys, In summary, while growth performance linearly up recommended requirement, was 106% 114%.