<prompt> Protein efficiency ratio isGain in weight protein consumedProduct of digestibility coefficient and biological value divided by 100Percentage of nitrogen retained out of nitrogen absorbedPercentage of protein absorbed after digestion  <response>: A. i.e. Gain in weight Protein consumed 702- Rana Shinde 7th 512 - U. satyanarayan 3rd1. PROTEIN EFFICIENCY RATIO PER - consists of feeding weaning 21 days old albino rats with a 10 test protein diet and recording the gain in body weight for a period of 4 weeks.Gain in weight of young animals per unit weight ofprotein consumedPER Gain in body weight gProtein consumed gThe PER for egg protein is 4.5 : for milk protein 3.0 for rice protein 2.22. BIOLOGICAL VALUE - defined of absorbed nitrogen retained by bodyBV Nitrogen retained---Nitrogen absorbedx 1003. NET - Protein Utilization NPU - defined of food Nitrogen that is retained in the bodyNPU Digestibility Cofficient x Biological valueProtein intake gm4. CHEMICAL SCORE - based on the chemical analysis of the protein for the composition of essential amino acids which is then compared with a reference protein usually egg proteinChemical score mg of the limiting amino acidg. test proteinmg. of the same amino acidg.egg proteinx 100 