Total crude protein is calculated from the nitrogen content of the feed material, based on sample type. The protein factor applied to the nitrogen result is 6.25 unless a different factor is requested. The method has a detection limit of 0.1% protein (dry basis).
Note: See SOP 522 for information on nitrogen analysis.
Sample amount requested: 3 g
Questions concerning limited sample size can be answered by the UC Davis Analytical Laboratory.
AOAC Official Method 990.03, Protein (Crude) in Animal Feed, Combustion Method, in Official Methods of Analysis of AOAC International, 18th edition Revision 1, 2006. Chapter 4, pp. 30-31, AOAC International, Gaithersburg, MD.