Methionine and cystine requirements of rainbow trout
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Abstract
Methionine and cystine requirements of rainbow trout (Salmo gairdneri) were studied by supplementing a 35% protein semipurified basal diet with these amino acids at graded levels in a factorial design. In experiment 1 (initial average weight of fish, 1.5 g), methionirie levels were 0.30, 0.45, and 0.60% of the diet and cystine levels were 0.04, 0.15, 0.30, 0.45, and 0.60%. In experiment 2 (initial average weight of fish, 8.8 g), methionine levels were 0.55, 0.75, and 0.95% and cystine levels were 0.04, 0.08, 0.12, 0.16, 0.24, and 0.32%. Methionine requirement was estimated to be between 0.55 and 0.75% in the presence of adequate dietary cystine and the cystine requirement was about 0.30% with a diet marginally deficient in methionine. The requirement for both sulfur amino acids was, therefore, between 0.85 and 1.05% of the diet or 2.50 and 3.00% of the protein. Molar efficiency of conversion of dietary methionine to cystine was highest (80%) when the diet was deficient in methionine; this efficiency decreased as levels of dietary methionine increased. Bilateral cataracts occurred in methionine‐deficient but not in cystine‐deficient trout.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Methionine and cystine requirements of rainbow trout |
| Series title | Progressive Fish-Culturist |
| DOI | 10.1577/1548-8659(1983)45[139:MACROR]2.0.CO;2 |
| Volume | 45 |
| Issue | 3 |
| Year Published | 1983 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | Leetown Science Center |
| Description | 5 p. |
| First page | 139 |
| Last page | 143 |