Dutch protein system

PDI = the French protein digested in the intestine system CPFD = the German crude protein flow at duodenum system DVE = the Dutch digestible protein in the intestine system AAT-PBV = the Nordic system AP = the American absorbed true protein system ADPLS = the Australian apparently digested protein leaving the stomach system CNCPS = the Cornell net protein and carbohydrate system. 

Froidmont, E., M. Bonnet, R. Oger, V. Decruyenaere, J.M. Romnee, Y. Beckers and N. Bartiaux-Thill, 2008. Influence of the grinding level and extrusion on the nutritional value of lupin seed Lupinus albus) for cattle in the context of the Dutch protein evaluation system. Anim. Feed Sci. Technol. 142, 59-73. 

Besides biocatalytic and microbial systems, we are increasingly employing animal and human cell lines for the production of advanced pharmaceutical products, including recombinant proteins such as antibodies. In collaboration with the Dutch-based biotech company Crucell, we are currently improving their PER.C6-based production platform for a range of human pharmaceutical proteins. 

The Dutch feed tables (CVB, 2000) use a net energy system that is very similar to the INRA system (Ellis, 2002). The German (DIG, 1995) and North American (NRC, 1989) tables use the digestible energy system. This system overestimates energy values, especially when cell walls and/or crude protein values are high (Martin-Rosset and Vermorel, 2002). 

The Dutch (CVB, 2000) and German (DLG, 1995) tables express the nitrogen value in MAD. In the North American tables, the nitrogen value is expressed as crude protein. The MAD and CP systems overestimate the nitrogen value of feed materials, notably for forages, and to a lesser extent for concentrates, when the levels of NDF and above all ligno-cellulose (ADF) are high (Marin-Rosset and Tisserand, 2002). 

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