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Sulfur Amino Acid Requirements of Immature Beagle Dogs¹

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

The methionine and total sulfur amino acid requirements of growing Beagle dogs were determined using diets containing purified L-amino acids as the sole nitrogen source. In the presence of 0.60% dietary L-cystine, optimal growth, feed efficiency, and nitrogen retention were attained in dogs fed diets containing 0.20% or more L-methionine. Two additional experiments revealed that maximal growth, feed efficiency, and nitrogen retention occurred in growing dogs fed diets containing 0.20% L-methionine and supplemented with 0.15% or more L-cystine. Therefore, the total sulfur amino acid requirement was estimated to be 0.39% methionine. Cystine, on an isosulfurous basis could effectively supply up to approximately 50% of the total sulfur amino acid requirement. In crystalline amino acid diets, D-methionine, DL-methionine, N-acetyl-L-methionine and methionine hydroxy analogue were effective in replacing the L-methionine requirement of growing Beagles. N-acetyl-D-methionine, however, was not efficiently utilized as a substitute for dietary methionine.

KEY WORDS: • dog • methionine • cystine • sulfur amino acids • D-methionine • N-acetyl-D- and L-methionine • methionine hydroxy analogue

¹ Presented in part at the annual meetings of the American Society of Animal Science, Abstract 202, 1980. Supported in part by the Nutrition Task Force for the Pet Food Industry and the Illinois Agriculture Experiment Station.

Manuscript received 28 April 1981.

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