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Utilization of Dietary Sulfur Compounds by Fingerling Channel Catfish: L-Methionine, DL-Methionine, Methionine Hydroxy Analogue, Taurine and Inorganic Sulfate¹

Department of Biochemistry, Mississippi State University, Mississippi State, Mississippi 39762

Sixteen isonitrogenous, isoenergetic diets were fed to fingerling channel catfish to study the efficacy of L-methionine, DL-methionine, methionine hydroxy analogue (OH-M), taurine and sodium sulfate. The basal diet contained casein and gelatin supplemented with crystalline L-amino acids to correspond to the amino acid pattern found in 24% crude protein from whole egg powder. The basal diet, containing 0.26% methionine was supplemented with graded levels of each of the sulfur sources on an isosulfurous basis. Growth and feed efficiency data indicate that channel catfish can utilize DL-methionine as effectively as L-methionine. OH-M was only about 26% as effective in promoting growth as L-methionine. No significant growth response was observed when taurine or inorganic sulfate was added to the basal diet.

KEY WORDS: • channel catfish • L-methionine • DL-methionine • methionine hydroxy analogue • taurine • inorganic sulfate

¹ Mississippi Agriculture and Foreatry Experiment Station Publication No. 3928.

Manuscript received 15 June 1978.