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- W2003263142 abstract "Summary Five g. of tryptophan were fed daily for 3 days to each of two dairy calves that had been maintained from birth on a whole milk diet. The amount of urinary excretion of nicotinic acid and its derivatives and tryptophan was determined on 24-hour samples and compared with similar data obtained previous to and following the tryptophan feeding. Tryptophan feeding resulted in a three- to four-fold increase in the excretion of total free and combined nicotinic acid. There was little change in the excretion of free nicotinic acid and N 1 -methylnicotinamide. The major portion of the increase was in the non-methylated products. The data indicate that N 1 -methylnicotinamide was not the main metabolic product excreted by calves. The urinary excretion of tryptophan accounted for only 1 to 1.5 per cent of the intake. Increase in dietary tryptophan results in increased urinary excretion of total nicotinic acid, indicating that tryptophan serves as a precursor of niacin in the young calf as in other mammals thus far studied." @default.
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- W2003263142 date "1948-10-01" @default.
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- W2003263142 title "The Nutrition of the Newborn Dairy Calf. II. Effect of Dietary Tryptophan on the Urinary Excretion of Niacin and its Metabolites by Young Dairy Calves" @default.
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- W2003263142 doi "https://doi.org/10.3168/jds.s0022-0302(48)92276-0" @default.
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