There are conflicting
opinions regarding the application of enzymes at the fat coater.
Should enzymes be applied to the feed before the fat, and then be
exposed to the high fat temperature and risk of enzyme inactivation,
or should they be applied post-fat application. With the concern
then focusing on the enzyme’s ability to penetrate the fat
coating on the pellets? Assay work carried out with samples from
the commercial feed mills have shown there to be no clear interaction
between enzyme stability and recovery, pre- or post-fat application,
of the enzyme at the fat coater. Research cited by Engelen (1998)
also supports this view. The recovery of Xylanase LC was shown to
be unchanged irrespective of the fat temperature, the fat level
and the spraying order.
Tech – Volume 7 Number 9/10 – 2003
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