The factors that determine
the quality of feed additives are the particle size [and its distribution],
the targeted concentration of the active material in the final feed
and the formulation technique use to manufacture the additive. This
leads to the following conclusions.
Reducing particle size
of feed additives gives a higher chance of a homogenous feed mix.
However, too small particles are prone to percolation and loss through
filters and sticking onto equipment.
size reduces the risk of feed mill contamination and carry-over.
However, increasing particle size decreases the distributability
of the active material with the risk that not all animals receive
the correct (not too few and not too much) amount of active material
with their daily diet.
Simple mixing is an
unsuited technique for manufacturing of additives. Such products
do not meet the quality requirements of the feed industry today.
Other formulation technologies (fluid bed processing, mixer granulation
and vacuum coating) exist which are better suited to obtain the
desired characteristics of the feed additive.
A properly formulated
and granulated feed additive [in terms of plasticity, hardness and
disintegrating behaviour], with the correct size reduces risk in
operation of a feed plant .It ensures that the proper amount of
active material reaches the animal and is liberated ‘on-site’
in the digestive tract. It’s a means of reducing risk with
feed additives and ensuring safety to both people and animals in
the feed and food chain
Feed Tech – Volume 7 Number 9/10 - 2003
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