Schadt’s research demonstrated that, regardless of the particle size of the ingested material, the particle size of the regurgitated bolus (cud) remained similar (see Table 1 and Photo 1). Particle size reduction from feed to bolusPicture of bolus (cud) chemically treated, dyed and separated into individual particles to determine mean particle size. This study also demonstrated that the particle size of the bolus (cud) was very similar between diets regardless of the particle size of the forages. Decreasing particle size of the diet may have more of an impact on cud chewing than increasing particle size. Some practical recommendations:The ultimate goal for forage particle size is to produce a homogenous TMR that reduces sorting behaviour.