Nitikanchana, S.Usry, J.L.Tokach, Michael D.Goodband, Robert D.DeRouchey, Joel M.Nelssen, Jim L.Dritz, Steven S.2012-11-282012-11-282012-11-28http://hdl.handle.net/2097/15097A total of 2,290 pigs (PIC 1050 × 337; initially 157 lb) were used to determine the effect of tryptophan source (L-tryptophan vs. soybean meal) and increasing SID tryptophan:lysine ratio in diets containing 30% dried distillers grains with solubles (DDGS) on finishing pig performance. Pens of pigs were balanced by initial weight and randomly allotted to 1 of 7 dietary treatments in a completely randomized design with 26 to 28 pigs per pen and 10 to 13 replications per treatment. Treatments were arranged as a 2 × 3 factorial with main effects of tryptophan source (L-tryptophan or soybean meal) and SID tryptophan:lysine ratio (18, 20, and 22% of lysine). The seventh treatment was a negative control diet formulated to a 16% SID tryptophan:lysine ratio.en-USSwineAmino acidsDDGSFinishing pigLysineTryptophanConference paper