Assertion: urea's nitrogen | /r/HasProperty | npn
Facets:
Source sentences:
text: Melamine use as non-protein nitrogen (NPN) for cattle was described in a 1958 patent.
text: Crude protein includes both true protein and non-protein nitrogen (NPN).
text: FDA permits a certain amount of cyanuric acid to be present in some non-protein nitrogen (NPN) additives used in animal feed and drinking water.