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This part of ISO 16634 specifies a method for the determination of the total nitrogen content and the calculation of crude protein content of oilseeds, oilseeds meals, compound feed, feed raw materials, premixtures from plant origin, and excreta.
For mineral premixtures and feed additives, the method of determination of the total nitrogen content described in this International Standard can be used. However, for these 2 matrices, the calculation of the protein content described in this international standard do not apply.
For excreta, the accuracy of the method has to be checked individually.
This method, like the Kjeldahl method, does not distinguish between protein nitrogen and non-protein nitrogen. For the calculation of protein content, the conversion factors used is 6,25.
This method is not applicable to milk and milk products, for which a method is specified in ISO 14891 | IDF 185[10].
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