When the mixed diet is fed to growing mice, the following data was recorded when

Question

When the mixed diet is fed to growing mice, the following data was recorded when fed the reference protein diet (E) and test protein diet (MP). Intakes and excretions are for the total period of feeding.

Mixed Diet: 3 proteins consisting of 47% cereal, 31% legume and 22% nuts/seeds


                                 E            MP

Starting average wt    25 g       28 g

Ending average wt      91 g       83 g

Dietary consumption
(g of dry matter)       326 g     318 g

Dietary crude protein
(% if dry matter)        12%      12.6%

Total Fecal output
(g of dry matter)         95 g      99 g

Fecal protein
(% of dry matter)         8.3%      9.1%

Nitrogen free diet
(% protein in feces)     2.4%     2.2%

Urinary protein (g)      9.48 g  10.56 g

Urinary protein on
Nitrogen free diet (g) 1.10 g     1.4 g

Mitochondrial concentration
per muscle cell              38          41

Calculate the Protein Efficiency Ratio (PER) for the two proteins and also calculate the Biological Value (BV) for each of the test proteins. Which protein do you think is better and why?

Explanation / Answer

Protein efficiency ratio (PER) is based on the weight gain of a test subject divided by its intake of a particular food protein during the test period. here for E PER=91-25/12 =5.5 here for MP PER=83-28/12.6 =4.3 hope this helps.................

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