The Hungarian metabolisable protein system

The new protein evaluation system was introduced in 1999. Metabolisable protein content of the feed means the ratio of amino acids absorbed in the small intestine of the animals. These amino acids can originate from the undegradable protein (UDP) and partly from the rumen degradable protein (RDP) contents of the feeds.
All the feedstuffs have two metabolisable protein contents, according to the potential of the certain feedstuff supporting the microbial protein fermentation in the rumen:
Energy dependent metabolisable protein (MFE): digestible undegradable protein + potential digestible microbial protein according to the energy content of the feedstuff
Nitrogen dependent metabolisable protein (MFN): digestible undegradable protein + potential digestible microbial protein according to the nitrogen content of the feedstuff
digestible UDP = 0.9 (UDP – ADIN x 6.25)
energy dependent digestible microbial protein: 160 FOM x 0.8 x 0.8
where FOM = fermentable organic matter nitrogen dependent digestible microbial protein: 0.9 RDP x 0.8 x 0.8