Converting nutrients from as fed to dry matter

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http://www.susanwynn.com/uploads/Dry_matter_conversions.doc

The percent dry matter is 100% - percent moisture
To find the dry matter content of the nutrient of interest, divide the as-fed number by the percent dry matter in the diet

Example calculation

Sample food contains:    
   Protein 22%
   Fat 12%
   Moisture 11%

To find the dry matter protein content, find the total dry matter content:
         100 % -11 % = 89% dry matter
      Dry matter protein level is 22/89 = 0.2472
Multiply X 100 to derive percent DM protein, which is 24.72%