Abstract
A 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.; Swine Day, Manhattan, KS, November 15, 2012
Highlights
SummaryA 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 Standardized ileal digestible (SID) tryptophan:lysine ratio in diets containing 30% dried distillers grains with solubles (DDGS) on finishing pig performance
Dried distillers grains with solubles are widely used in swine diets in the United States
A 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 Standardized ileal digestible (SID) tryptophan:lysine ratio in diets containing 30% dried distillers grains with solubles (DDGS) on finishing pig performance
Summary
A 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. 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). Increasing SID tryptophan:lysine ratio improved (quadratic, P < 0.01) F/G up to 20% when soybean meal was the source of tryptophan, but the optimum was at only 18% when L-tryptophan was added. For the main effect of SID tryptophan:lysine ratio, ADG and F/G improved (quadratic, P < 0.01), with increasing SID tryptophan:lysine ratio demonstrating the best performance when SID tryptrophan was at 20% of lysine. Soybean meal or L-tryptophan provided a similar response in growth performance, the difference in feed cost when adding soybean meal or crystalline tryptophan to the diet will be a major factor in choosing the optimal source of tryptophan
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