where DA is the digestibility or retention of a nutrient
(%) in an assay feedstuff (SECM or EECM), DD
is the digestibility or retention of a nutrient (%) in an
assay diet (corn- and SECM-based diet or corn- and
EECM-based diet), DB is the digestibility or retention
of a nutrient (%) in the basal feedstuff (corn), SB is the
contribution of a nutrient (decimal percentage) from
corn to the assay diet, and SA is the contribution of a
nutrient (decimal percentage) from SECM or EECM to
the corn- and SECM-based or corn- and EECM-based
diet. The DE and ME contents of SECM and EECM
were determined using the following equations