Crude protein will include both true protein and non-protein nitrogen.
Cattle can use both types to some varying degree.
Crude protein values give no indication if heat damage has occurred, which may alter protein availability. Protein A forage analysis report will not always show this value unless heat damage is suspected and the analysis is requested. This value will give an indication if excessive heating has occurred, reducing protein digestibility. All forages have some unavailable protein. In some reports, this value will be the difference between crude protein and unavailable protein.