ME (kcal/kg) = 10 x
Where: ME = Metabolizable Energy
CP = % crude protein "as fed"
CF = % crude fat "as fed"
NFE = % nitrogen-free extract (carbohydrate) "as fed"
And the percentages ofiCP and CF are the average values of these components in the product as determined by sound scientific methods, such as, but not limited to scientifically accurate calculations made from the formula of the product or upon chemical analysis of the product. The NFE is calculated as the difference between 100 and the sum of CP, CF, and the percentages of crude fiber, moisture and ash (determined in the same manner as CP and CF); or
Md. Code Regs. 15.18.09.11