1.It can improve the mixing uniformity;

2.Particle size is blance,it reduce feed separation;

3.Digestive area is the greatest;

4.It can improve feed intake.

You need to  ditermine suitable particle size according to nutrition and processing technology.From the viewpoint of nutrition,,fine size  material are propitious to increase feed surface area and improve nutrient difestibility,but too fine crushing will increase the incidence rate of animal gastrelcosis,meanwhile,it has improve crushing cost significantly;