Effective ruminal protein degradation (EPD) and the intestinal digestibility of undegraded protein (IUPD) of rapeseed oilmeal (RSM) subjected to extrusion at a temperature of 140^oC was determined. The protein EPD coefficient of the extruded rapeseed oilmeal (ERSM) was 55.5%, whereas that of the RSM not subjected to extrusion, 79.3%. The intestinal digestibility of rumen undegraded RSM protein was 55.5%, which was 38.3 percentage points lower than the IUPD of the ERSM. The total tract protein digestibility of both meals was similar. The high IUPD of the ERSM indicates a favourable shift of protein availability from the rumen to further sections of the gastrointestinal tract.