Protein efficiency ratio is
A. i.e. (Gain in weight / Protein consumed) (702- Rana Shinde 7th) (512 - U. satyanarayan 3rd)1. 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 consumed**PER =Gain in body weight (g)Protein consumed (g)The 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 (gm)4. 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 protein)Chemical score =mg of the limiting amino acid/g. test proteinmg. of the same amino acid/g.egg proteinx 100
Gain in weight / protein consumed
Product of digestibility coefficient and biological value divided by 100
Percentage of nitrogen retained out of nitrogen absorbed
Percentage of protein absorbed after digestion
Proteins and Amino Acids