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Threonine, Tryptophan and Histidine Requirements of Immature Beagle Dogs¹

Department of Food Science, 905 S. Goodwin Ave., University of Illinois, Urbana, IL 61801

The threonine, tryptophan and histidine requirements of growing male Beagle dogs were determined using diets containing the equivalent of 14% protein as crystalline L-amino acids. For each amino acid the requirement was taken to be the minimum dietary quantity required for optimal growth, feed efficiency and nitrogen retention. In experiment 1 the threonine requirement was found to be provided by 0.52% or more dietary threonine. In experiments 2 and 3 the minimal dietary tryptophan and histidine requirements of immature dogs were estimated as 0.17 and 0.21%, respectively. The requirements for threonine and tryptophan are similar to those for growing rats. However, the histidine requirement of Beagles appears to be lower than that of rats.

KEY WORDS: • threonine • tryptophan • histidine • dog

¹ Supported in part by the Nutrition Task Force for the Pet Food Industry.

Manuscript received 18 August 1981.