Nutrition
Protein Efficiency Ratio PER
Weight gain in grams per gram of protein consumed, measured in growing rats.
Real-life application
An older method still referenced in nutrition labelling and animal-feed formulation to compare how well different protein sources support growth.
Related terms
Biological value
NutritionThe proportion of absorbed nitrogen retained by the body, expressed as a percentage.
Limiting amino acid
NutritionThe essential amino acid present in a protein in the smallest amount relative to requirement, capping the use of all the others.
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