Response of rainbow trout to source and level of supplemental dietary methionine

H. A. Poston

doi:10.1016/0300-9629(86)90720-6

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Response of rainbow trout to source and level of supplemental dietary methionine

H. A. Poston

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Abstract

1. Methionine and total sulfur amino acid (TSAA) requirements of rainbow trout ( Salmo gairdneri ) were investigated by feeding graded isosulfurous levels of l - and dl -methionine, l -cystine, and the free acid and calcium forms of methionine hydroxy analog (MHA). 2. Added cystine did not promote growth, survival or prevent cataracts. 3. l -methionine produced fastest growth, followed by dl -methionine, CaMHA and free acid MHA. 4. Trout fed CaMHA gained 85.7 and 92.3% as much as those fed l -methionine and dl -methionine. 5. Within each experiment, the level of L-methionine isomer that prevented cataracts was constant (1.86 g/100g protein in experiment (1), 1.45 in experiment (2) and was lower than for maximum growth (2.89 and 2.15 g) regardless of methionine source.

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H. A. Poston. 1986. Response of rainbow trout to source and level of supplemental dietary methionine. https://doi.org/10.1016/0300-9629(86)90720-6

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