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An often-used analysis of feedstocks for lifestocks is the Weender analysis, which basically divides the volatile solid content into fats, fibre and protein, as well as N-free matter. I found no English language article on the process.

The individual values and how they are arrived at are:

  • Fat: anything dissolvable in organic solvents;
  • Fibre: anything not dissolvable in acids or bases;
  • Protein: N-content times 6,25 or 6,38 for plants or protein (and the N-content in protein is most of the times close to 16%);
  • N-free: the rest (sugars, starch, pectines, organic acids ...).

This data is often more readily available than a full chemical analysis.

I want to know the sulphur content - can I reliably say fats contain v mass-% sulphur, proteins x mass-% ... and so on? If yes, would this be applicable to manure also?

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