The Feeding advisor

Protein-Fractions (N-Fractions)

The estimation of rumen microbial protein synthesis and by pass protein is based in part of extensive chemical fractionation of protein. The analytical methods were summarized and published by Licitra et. al (1996). Currently, the five fractions A1, A2, B1, B2 and C are determined in the CNCPS system. The classification into the fractions (not the analytics!) is different to the original classification...