<prompt> Protein efficiency ratio isGain in weight per unit of protein consumedProduct of digestibility coefficient and biological value divided by 100Percentage of nitrogen retained out of the nitrogen absorbedPercentage of protein absorbed after digestion  <response>: Protein Efficiency ratio is one of several methods which may be employed for evaluation of quality of protein:Protein efficiency ratio Weight increase in grams Gm. of protein consumedProtein efficiency ratio measures the influence on the weight increase in weaning animals. 