<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>G. L. Rumsey</dc:contributor>
  <dc:creator>H. A. Poston</dc:creator>
  <dc:date>1983</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Two experiments were conducted to determine the concentration of dietary tryptophan needed for optimal growth and survival of fingerling rainbow trout (&lt;/span&gt;&lt;i&gt;Salmo gairdneri&lt;/i&gt;&lt;span&gt;), to characterize signs of tryptophan deficiency, and to ascertain the effects of niacin on deficiency signs. Test diets containing either hydrolyzed or intact casein were fed with graded levels of added L-tryptophan (0.0, 0.25, 0.50, 0.75 and 1.0 g/100 g protein). Maximum growth occurred at 0.75 and 0.50 g tryptophan in fish fed hydrolyzed and intact casein, respectively. Changes in mineral and amino acid mixtures in the intact casein diet yielded a cation-anion (Na + K - Cl) balance of + 15.3 meq/100 g diet and pH of 6.44, compared with a balance of -21.3 and -25 meq, and pH 5.8 and 4.4 for unmodified hydrolyzed and intact casein diets, respectively. Analysis of growth by the polynomial regression function;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Y&lt;/i&gt;&lt;span&gt;&amp;nbsp;= 0.16 + 0.429&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;span&gt;&amp;nbsp;- 0.26&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;, where&amp;nbsp;&lt;/span&gt;&lt;i&gt;Y&lt;/i&gt;&lt;span&gt;&amp;nbsp;= mean daily gain in grams, and&amp;nbsp;&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;span&gt;&amp;nbsp;= grams of added tryptophan/100 g protein, predicted that at least 0.58 g of tryptophan was needed for maximum weight gain. Analysis of apparent pathology-free fish by the function;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Y&lt;/i&gt;&lt;span&gt;&amp;nbsp;= 34.33 + 147.33&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;span&gt;&amp;nbsp;= 83.87&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;, where&amp;nbsp;&lt;/span&gt;&lt;i&gt;Y&lt;/i&gt;&lt;span&gt;&amp;nbsp;= percentage with no signs of deficiency, and&amp;nbsp;&lt;/span&gt;&lt;i&gt;X&lt;/i&gt;&lt;span&gt;&amp;nbsp;= grams of added tryptophan, predicted that 0.63 g tryptophan/100 g protein was needed for optimum health scores. Deletion of supplemental niacin did not affect fish response to tryptophan.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1093/jn/113.12.2568</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Factors affecting dietary requirement and deficiency signs of L-tryptophan in rainbow trout</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>