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I did some basic research and it looks like Crude Protein is directly extrapolated from the Nitrogen content. One source said Crude Protein = 6.25 * N [1]. Others had similar numbers. It seems that we should be able to just divide by 6.25 and then divide again by the molecular weight of Nitrogen vs. Nitrate. Does this sound right?
Randy had a great article on Phosphate[2], which directly addressed a puzzling fact that Amino Acids don't have Phosphate, but that most organisms attach it. I'm still not totally sure if we can derive this from the Nitrogen content, however.
That brings us to a few of the other components:
[1] https://www.feedipedia.org/node/8329
[2] http://www.advancedaquarist.com/2012/3/chemistry
[3] http://people.umass.edu/~mcclemen/581Ash&Minerals.html
Randy had a great article on Phosphate[2], which directly addressed a puzzling fact that Amino Acids don't have Phosphate, but that most organisms attach it. I'm still not totally sure if we can derive this from the Nitrogen content, however.
That brings us to a few of the other components:
- Crude Fat (Lipids): these are complex and I have no idea where to begin.
- Ash: this appears to just be the leftover inorganic "stuff" after heating/oxidizing the organics[3].
[1] https://www.feedipedia.org/node/8329
[2] http://www.advancedaquarist.com/2012/3/chemistry
[3] http://people.umass.edu/~mcclemen/581Ash&Minerals.html