HOW TO CONVERT FOOD VALUES FROM "AS FED" TO "DRY MATTER":
First, find the "Guaranteed Analysis" on the label of the food. It should look like this:
Crude Protein (min) 7.5%
The Moisture content is 76%. Subtracting from 100%, that means that there is 24% dry matter (the actual food). In other words, this can of puppy food is 76% water and 24% actual nutrients.
To convert the Guaranteed Analysis numbers to dry matter basis, simply divide them by the percentage of the diet that is dry matter:
Crude Protein: 7.5 divided by 24 = 0.31 or 31%
Foods can only truly be compared by converting to dry matter basis.
Page posted: 2/15/2018