Abstract
Summary and conclusionsData on growth, body composition and liver 3HAA and PC assays indicate that L-tryptophan is an inefficient precursor of dietary niacin for the brook trout.The brook trout has a high liver PC activity. While this enzyme activity, alone, indicates a high requirement for dietary niacin, the 3HAA/PC ratio is a more meaningful indicator of the efficiency of the tryptophanto-niacin conversion in the brook trout and other species.An investigation of the PC and 3HAA activities of other salmonids should help elucidate interspecies and intergeneric variations in niacin requirements.
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