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Amino Acid Requirements of the Growing Mouse

Department of Animal Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada. S7N 0W0

Using diets based on rat amino acid requirements, containing 2.0% nitrogen and 4.1 digestible kcal/g, the dietary levels of ten essential amino acids required for normal post-weaning growth of Swiss x Carworth Farms No. 1 crossbred mice were estimated. The response criteria used were growth rate, dry matter intake, energy and protein contents of body weight gain, protein efficiency ratio and apparent biological value. Maximum responses were obtained when the dietary dry matter contained 0.3% arginine, 0.2% histidine, 0.4% isoleucine, 0.7% leucine, 0.4% lysine, 0.5% methionine, 0.4% phenylalanine, 0.4% threonine, 0.1% tryptophan and 0.5% valine.

KEY WORDS: • amino acid requirements • mice • growth

Manuscript received 4 March 1976.

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