The official name of the "voedernormenboekje" is "Tabellenboek Veevoeding" (van het Centraal VeevoederBureau), translated in English as "Tables book Animal Feed" or "Table Booklet Animal Nutrition" or ''Animal Feed Table Booklet" (one part of it also called the "normenboekje/ standards booklet"). It is also called Veevoedertabel.
But all this is not point.
The asker wants us to explain a joke, which is always something of a cumbersome procedure, but I explained it very clearly below and I am sure she is going to get it. :-)
http://www.pdv.nl/nederland/Voederwaardering/cvb-productenpa...