Calculating Protein Percentages of Eggs and Peas

[Kiki]

I really can't understand what is going on here!

I think Egg calculates protien percentages on calories.
I think cpony calculates it on weight.


Is this correct ladies?

 

[casportpony]

I think Egg calculates protien percentages on calories.
I think cpony calculates it on weight.


Is this correct ladies?

I do it by weight.

 

[Kiki]

I do it by weight.

Ok them I'm for sure half way correct.

I think this is the correct way...from my reading.

 

[Folly's place]

This has been a fun conversation! Having livestock nutrition classes in college, in the dark ages before computers/ calculators, I lost interest in doing this stuff myself. It is all about calculation values on a dry weight basis, and I'm glad you are having fun here too.
Mary

 

[Kiki]

This has been a fun conversation! Having livestock nutrition classes in college, in the dark ages before computers/ calculators, I lost interest in doing this stuff myself. It is all about calculation values on a dry weight basis, and I'm glad you are having fun here too.
Mary

I love this kind of learning thread.

 

[Akrnaf2]

I do it by weight.

That is the correct way .
5 grams of proteins in a 50 grams egg = 10%
If you dry the egg to powedr and get 15 grams of egg powder you still have 5 grams of protein but now it is 5 grams off 15 grams total and now it is 5/15*100=33%

 

[Kiki]

That is the correct way .
5 grams of proteins in a 50 grams egg = 10%
If you dry the egg to powedr you and get 15 grams of egg powder you still have 5 grams of protein but now it is 5 grams off 15 grams total and now it is 5/15*100=30%

I get this!

 

[Akrnaf2]

I get this!

So I can be a teacher also in English?
And it is 33.33% And not 30% as I have written long day....

 

[Chris2018]

. You are comparing apples to oranges. % and grams of protein aren't the same thing. An egg is mostly water. Remove the water (all feed values are on a dry basis) and what you are left with is protein, fat, carbohydrates and ash (residue from minerals and vitamins once the first 3 have been burnt off). Now I'm rounding up for simplicity. An average large egg weighs 56g. It's 75% water (moisture) .That leaves us with 14g stuff. If the protein % of eggs is 50% then an egg has 7g of protein. 50% protein sounds impressive but we aren't feeding dry egg powder. It still only has 7g.

I wasn't sure which protein amount was wanted BUT we can look at it this way also, One large egg contains six grams of protein and since the average large egg is 50 grams, the protein percentage would be 12%.
Since all the feedstuff analysis charts Ive seen and used has the protein percentage of feedstuff (not the grams of proteins) it make sense to me to use percentage of protein for calculating the total feed analysis.

Also I'm aware of what ash is.

The ash content of the feed contains all the minerals in the feed, but can also contain any soil contaminants associated with the feed as well.
The ash content of the feed is determined by placing a weighed sample of dried feed in a furnace and heating it to 500° C, typically overnight. At this temperature, all the organic materials in the feed (proteins, carbohydrates, fats and vitamins) are burnt away, leaving just the mineral residue. This residue is then weighed and the ash content of the feed (g ash/kg feed DM) is calculated from:
Ash content of the feed = Weight of ash (g)/ weight of dried feed (kg)

 

[Folly's place]

That 50g egg is not it's dry weight, so calculations based on dry weight don't apply.
Likewise, those green peas; were they dried peas, or fresh?
Must be consistant!
Mary