Effects of Standardized Ileal Digestible Lysine Level on Growth Performance in 170 to 220 lb DNA Finishing Pigs

The objective of this study was to estimate the SID Lys requirement for growth and feed efficiency 170- 220-lb finishing pigs. A total 616 barrows gilts (600 × 241, DNA; initially 168.3 ± 2.7 lb BW) were used in two separate studies each lasting 21 d. Pens pigs blocked by BW randomly allotted 1 7 dietary treatments with 8 10 per pen a randomized complete block design. similar number placed pen. Dietary corn-soybean meal-based formulated 0.58, 0.65, 0.72, 0.79, 0.86, 0.92, 1.00% Lys. There 11 replications treatment levels 0.92% Lys; 6 0.58% treatment; 5 treatment. Increasing increased (linear, P = 0.022) ADG. Feed (quadratic, 0.034) improved, while intake/d, intake/kg gain < 0.001) increasing At both high low ingredient pig prices, cost cost/lb 0.05), revenue tended increase 0.051) as increased. However, at there no differences income over (IOFC) among treatments.