Determination of proteins in different feeds using the in sacco method in comparison to the CNCPS method

The aim of this study was to determine the correlations between output parameters in sacco method and CNCPS (Cornell Net Carbohydrate Protein System). Both methods were tested on 106 samples from feeds classified into following categories: extracted meal cakes, cereals, legumes, maize alfalfa silage, other silages, DDGS (dried distiller’s grains with solubles), oilseeds various hays. effective degradability crude protein (EDg CP) by varied depending type feed 44.97% (hays) 82.59% (alfalfa silage). lowest degradation parameter rapidly degraded fraction (a=24.3%) highest potentially (b=70.52%) found oilseeds. Five nitrogen fractions (A, B1, B2, B3, C) determined according method. Fraction A (NPN – non-protein nitrogen) different examined silages (44.95% total CP). B2 represented part CP, (except for oilseeds). B3 ranged 1.96% (legumes) 19.25% CP. correlation EDg CP soluble low (r=0.5464) concentrate feeds, (r=0.6323) also forages.