Abstract
A total of 1,134 gilts (each initially 85 lb, PIC L337 x C22) was used in a 28-d experiment to evaluate the effects of replacing soybean meal with up to 8 lb/ton of crystalline Llysine HCl with other crystalline amino acids on growth performance. Gilts were randomly allotted to one of six experimental diets. Diets were corn-soybean meal-based with 3% added fat. Diets included a negative control containing 3 lb/ton of L-lysine HCl and formulated to 0.90% true ileal digestible lysine. Two additional diets were formulated with 3 lb/ton Llysine to 1.0% true ileal digestible lysine but with or without crystalline threonine and methionine to compare threonine to lysine ratios of 60 versus 65% and methionine & cystine (TSAA) ratios of 55 vs. 60%. The three remaining diets contained 6, 7, or 8 lb/ton of Llysine HCl with crystalline threonine and methionine to provide the same ratios relative to lysine of 65 and 60%, respectively.
Highlights
Last year the first commercial production facility dedicated to L-threonine production was opened in the United States
A total of 1,134 gilts was used in a 28-d experiment to evaluate the effects of replacing soybean meal with up to 8 lb/ton of crystalline Llysine HCl with other crystalline amino acids on growth performance
Using 6, 7, or 8 lb/ton of Llysine HCl with added threonine and methionine in diets formulated to 1.0% true ileal digestible lysine had no effect on ADG or F/G, but did tend to decrease ADFI
Summary
L-threonine has become more widely available and less expensive for use in swine diets. The use of Lthreonine would allow for greater amounts of L-lysine to be used than the typical 3 lb/ton inclusion and less soybean meal. This will have environmental advantages by further decreasing nitrogen concentration in swine waste by another 20% compared with adding 3 lb/ton L-lysine alone. The key to adding greater than 3 lb/ton of L-lysine and other amino acids is an understanding of the correct amino acid ratios relative to lysine so deficiencies do not result in poorer pig growth performance. The objective of this study was to evaluate the effects of increasing L-lysine HCl in finishing pig diets held at a constant percentage of true ileal digestible lysine (1.0%)
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