ANN 111: Principles of Animal Nutrition and Feed Technology (2+1)

Protein Efficiency Ratio

PROTEIN EFFICIENCY RATIO (PER)

• The protein efficiency ration normally uses growth of the rat as a measure of the nutritive value of dietary proteins.
• It is defined as the weight gain per unit weight of protein eaten and may be calculated by using the following formula.

PER = Gain in body weight / Protein consumed

• Usually a diet containing 10% of protein and eaten by male albino rats of 21 days old is used and the assay period is four weeks.