NPN

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Related to nonprotein nitrogen: urea

NPN

abbr.
nonprotein nitrogen
References in periodicals archive ?
The protein content, the total nitrogen content and the nonprotein nitrogen content in ODPs were 1.
Moisture, ash, protein, total and nonprotein nitrogen, carbohydrates, and lipid contents, as well as percent edibility and CI were assessed with monthly periodicity for 1 y.