The
modified method has been used to test very hard pellets such
as dairy feed pellets [23]. Stevens [25] and Cavalcanti [26] used
five to six 12.7mm(1⁄2 in.) hexagonal nuts to add more severity
to the durability test in order to more accurately determine
the treatment effects during pelleting of corn- and wheatbased
swine diets. Several authors have used the tumbling
can method with some variations in the speed of tumbling,
length of time of tumbling, sieve size, or the amount of
samples tumbled