Urease index has been proven to be
a useful assay in determining whether SBM has been
adequately heated to deactivate the antinutritional factors,
but it is not a good indicator of excessive heating
(Herkelman et al., 1991; Parsons et al., 1991). Although
urease level between 0.05 and 0.20 is considered optimum,
urease index below 0.05 does necessarily mean
the SBM is overprocessed (Waldroup et al., 1985; Araba
and Dale 1990; Parsons et al., 1991).