Effects of Increasing Soybean Meal and Valine:Lysine and Tryptophan:Lysine Ratios on Finishing Pig Performance

A total of 621 pigs (DNA 241 × 600; initially 138.0 ± 5.5 lb) were used in a 65-d growth trial to determine the effect increasing soybean meal (SBM) and Val:Lys Trp:Lys ratios on finishing pig performance. Experimental diets corn-soybean meal-DDGS-based fed 3 phases. The 6 dietary treatments arranged 2 factorial with main effects SBM level (low, medium, high) (standard high). additional amino acids (AA) provided by levels standard AA expected result higher ADG balancing out high leucine from corn. Conversely, was stay same as increased when feed increased. Pens assigned randomized complete block design BW blocking factor. There approximately 8 or 9 per pen 12 replicate pens treatment. No evidence (P > 0.05) ratio interactions treatment differences observed for any response criteria phases 1 study. In phase 3, marginally significant = 0.084) interaction ADG. medium resulted greater (quadratic, P 0.003) compared other levels. 0.501). Additionally, F/G improved 0.007) at 3. spite improvement there no 0.10) overall ADFI. 0.052) F/G. Increasing poorer 0.049) difference 0.435) feeds ratios. conclusion, early responses SBM; however, late period included 0, 4, 8% SBM, 4% BCAA had Throughout study, little