Preliminary study: voluntary food intake in dogs during tryptophan supplementation.

Víctor Fragua, Gemma González-Ortiz, Cecilia Villaverde, Marta Hervera, Valentina Maria Mariotti, Xavier Manteca, María Dolores Baucells

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Abstract

Tryptophan, a precursor of important molecules such as serotonin, melatonin and niacin, is an essential amino acid for dogs. In pigs, tryptophan supplementation has been shown to induce a significant increase in food intake. The aim of the present study was to assess whether long-term tryptophan supplementation increases voluntary food intake in dogs and to observe whether this was accompanied by a change in serum ghrelin. In the present study, sixteen adult Beagle dogs were used, with four male and four female dogs fed diets supplemented with tryptophan (1 g/dog per d) during 81 d (Trp) and four male and four female dogs that were not supplemented (control). A voluntary food intake test was performed during 5 d following the supplementation period. The Trp group tended to show a higher food intake during the voluntary food intake test (58.0 (SE 5.37) v. 77.5 (SE 3.65) g/kg metabolic weight per d; P = 0.074). No significant differences were found for serum ghrelin concentrations.
Original languageEnglish
JournalThe British journal of nutrition
Volume106 Suppl 1
Publication statusPublished - 1 Jan 2011

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