Efficacy of a Lysine-Tryptophan Blend for Growth of Chicks

David H. Baker, Sergio R. Fernandez, Hardy M. Edwards, Carl M. Parsons

Research output: Contribution to journalArticlepeer-review


Two chick experiments were conducted to compare the growth-promoting efficacy as well as the toxicity of a new source of L-tryptophan and L-lysine, Tryptosine® (16.1% tryptophan, 56.3% lysine). A corn-feather meal-soybean meal basal diet was made singly deficient in either lysine or tryptophan, and graded doses of lysine or tryptophan from either Tryptosine® or feed-grade sources of lysine and tryptophan were supplemented. Linear (P < .01) weight gain responses occurred, and responses to lysine or tryptophan in Tryptosine® were similar to those obtained with equal doses of lysine or tryptophan provided by feed-grade sources of L-lysine·HCl or L-tryptophan. The toxicity trial involved additions of 1, 2, or 4% lysine with .29, .58, or 1.16% tryptophan to a lysine- and tryptophan-adequate corn-soybean meal diet. Both amino acids were provided as either Tryptosine or as feed-grade sources of lysine and tryptophan. Weight gain and feed intake were reduced in a linear fashion (P < .01) as levels of the two excess amino acids increased. The decreases caused by Tryptosine were similar to those caused by equivalent levels of excess feed-grade lysine and tryptophan.

Original languageEnglish (US)
Pages (from-to)1063-1066
Number of pages4
JournalJournal of animal science
Issue number5
StatePublished - May 1996


  • Chicks
  • Lysine
  • Tryptophan

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics


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