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Lysine Requirements of the Immature Dog¹

Department of Food Science, University of Illinois, Urbana, IL 61801

These studies examined the lysine requirement of the immature Beagle dog fed a purified L-amino acid diet. The immature female dog was found to require between 0.461 and 0.577% dietary lysine for optimum growth and nitrogen balance. Plasma and urinary urea were significantly increased in female dogs fed 0.461% or less dietary lysine. Maximum growth and nitrogen balance occurred in immature male dogs fed 0.577% or more lysine. Consumption of diets containing excess dietary lysine (1.73%) significantly reduced growth in both immature male and female dogs. Varying dietary lipid from 5 to 20% did not appear to alter the lysine requirement of the immature male dog. Increasing the nitrogen content of the diet from approximately 14% crude protein to 28% accentuated the symptoms of low lysine intakes. The lysine requirement of the immature dog appears to be lower than that reported for the growing pig or rat.

KEY WORDS: • lysine • dogs • urea • nitrogen • amino acids

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

Manuscript received 10 April 1980.