PSIV-21 Impact of Increasing Standardized Ileal Digestible valine:lysine in Diets Containing 30% Dried Distillers Grains with Solubles on Early Grow-finish Pig Performance

Abstract

Abstract Minimal research has investigated the valine (Val) requirement in grow-finish pig diets, especially when diets contain dried distillers grains plus solubles (DDGS). Therefore, the objective of this study was to determine the standardized ileal digestible (SID) Val:lysine (Lys) requirement in diets containing 30% DDGS. A total of 2,430 pigs (39.4 ± 0.21 kg) were used in a 28-d trial (15 replicates per treatment). Pens were randomly allotted within block to one of six dietary treatments: 30% DDGS diets with a SID Val:Lys ratio of 60, 65, 70, 75, and 80% or a corn-soybean meal diet (CS). Data were analyzed as a randomized complete block, pair-wise comparisons and single degree of freedom orthogonal polynomials (DDGS diets only) were used to evaluate treatment responses, and pen was the experimental unit. Straight broken line (SBL) and quadratic broken line (QBL) regression analysis was used to estimate the SID Val requirement. Increasing SID Val:Lys up to 70% in 30% DDGS increased final BW, ADG and G:F (quadratic; P < 0.001), while increasing SID Val:Lys up to 75% in DDGS diets increased ADFI (quadratic; P < 0.001) Pigs fed CS had greater (P < 0.032) ADG, G:F, and ADFI compared to diets containing 30% DDGS except for cumulative ADFI of pigs receiving diets with 75% SID Val:Lys (P = 0.167). The SBL analysis estimated SID Val:Lys requirement at 66.4, 65.4, and 68.0% for ADG, ADFI, and G:F of pigs from 39.4 to 52.9 kg of body weight (BW) and 66.8, 65.7, and 70.4% for the pigs between the BW of 52.9 and 66.4 kg. The QBL analysis revealed a similar SID Val:Leucine ratio of 52.2% for G:F in both periods. This data suggests a SID Val:Lys requirement of 66.6% in diets containing 30% DDGS for pigs between the BW of 39.4 to 66.4 kg. Increasing the SID Val:Lys ratio in 30% DDGS diets did not improve performance congruent to CS fed pigs.