Precision and additivity of organic matter digestibility obtained with an in vitro multi enzymatic method

摘要

EDOM is an in vitro multi-enzymatic method for the estimation of organic matter digestibility (OMD) of feeds (Weisbjerg and Hvelplund, 1993). The aim of this study was to evaluate the precision of the EDOM method and determine its additivity as compared to the long-assumed additive property of chemical components of compound feeds. 118 samples, 49 compound and 69 ingredients were analyzed by EDOM (AU laboratory, Foulum, Denmark) with two repetitions separated in space and time. Samples were further analyzed for OMD by EDOM, dry matter (DM), ash, crude protein (CP), NDF and starch on a commercial laboratory. The EDOM method resulted in an intra-laboratory correlation of 99% and an inter-laboratory correlation of 92%, with no significant mean bias between the two laboratories tested.