The Effect of Increasing Valine, Isoleucine, and Tryptophan:Lysine Ratios on Pigs’ Growth Performance and Carcass Characteristics When Fed Diets with Increased Levels of Dietary Leucine:Lysine

A total of 4,076 pigs (initially 86.5 ± 1.24 lb) were used across 2 experiments to evaluate the effect increasing ratios Val, Ile, and Trp Lys on pig growth performance carcass characteristics in corn-soybean meal-DDGS-based diets containing increased levels dietary Leu:Lys. In both experiments, 4 treatments as follows: 1) high soybean meal low feed grade amino acids (control); 2) acids, with Val:Lys, Ile:Lys, Trp:Lys at 67, 55, 18, respectively, (low ratio); 3) same diet except 72, 60, 21, (medium 4) 80, 65, 23, respectively (high ratio). All contained 30% DDGS until reached approximately 220 lb, then 20% trial completion. Overall ADG average ADFI (AA ratio; linear, P < 0.05) from high. Pigs fed control exhibited when compared ratio diets, while medium showed intermediate performance. summary, level can be reduced, synthetic acid long are increased.