Different methods for the evaluation of the attrition behaviour of pellets supply
different information. It is obvious that it is not possible to use each type of device with
every type of feed pellets. The choice for a certain method therefore is partly determined
by the objective of the measurement, related to handling or nutritional purposes or to
study simulated production of fines caused by either fragmentation or abrasive stres.ses.
The described methods for the evaluation of physical quality of pellets have been
shown to be tests that use stresses brought about by bending/tension or compression. In
the context of animal feed pellets, bending tests and tensile tests in general may give
more information compared with compression tests (Luyten et al., 1992) but are of less
value due to the type of attrition that feed pellets undergo between manufacturing in the
feed mill and the animal feeding trough.