Journal of Nutrition

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Journal of Nutrition Vol. 110 No. 9 September 1980, pp. 1805-1812
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Total Aromatic Amino Acid Requirement, Phenylalanine Requirement and Tyrosine Replacement Value for Fingerling Channel Catfish1

Edwin H. Robinson, Robert P. Wilson and William E. Poe

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

A series of experiments was conducted to determine the aromatic amino acid requirement, the tyrosine replacement value for phenylalanine and the phenylalanine requirement under conditions of adequate tyrosine for fingerling channel catfish. Effects of excessive dietary levels of tyrosine were also investigated. The studies were conducted utilizing casein and gelatin-based diets supplemented with crystalline L-amino acids to correspond to the pattern of 24% whole egg protein. Based on 8-week growth studies, the total dietary aromatic amino acid requirement for fingerling channel catfish was approximately 1.20 ± 0.06% (5.0% of the dietary protein) of which about 50% could be supplied by tyrosine. The phenylalanine requirement per se, based on growth and feed efficiency, was determined to be 0.47 ± 0.02% and 0.49 ± 0.02%, respectively. High dietary levels of tyrosine (up to 10%) did not adversely affect performance of fingerling channel catfish. It appears that neither serum-free phenylalanine nor serum-free tyrosine can be used to accurately predict dietary aromatic amino acid adequacy for the fingerling channel catfish.

KEY WORDS: • aromatic amino acids • phenylalanine • tyrosine • channel catfish

1 Mississippi Agriculture and Forestry Experiment Station. Publication No. 6011.

Manuscript received 4 February 1980.




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