How is the amount of crude protein measured ?
In at least one segment of the food industry , the dairy industry , some countries ( at least the U.S. , Australia , France and Hungary ) , have adopted " true protein " measurement , as opposed to crude protein measurement , as the standard for payment and testing : " True protein is a measure of only the proteins in milk , whereas crude protein is a measure of all sources of nitrogen and includes nonprotein nitrogen , such as urea , which has no food value to humans .