Feed Strategy - January 2018 - 26
26 ❙ FeedStrategy
How feed extrusion can
improve digestibility, safety
The pressure to increase feed digestibility is just one driving force
behind extrusion technology in the livestock industry.
he feed industry developed
its first extrusion technology
nearly a century ago using
steam and pressure to cook feed.
Since then, the extrusion process
has progressed to achieve a variety of production goals with an
assortment of technologies.
From expanders to twin-shaft
extrusion to dry heat and steam,
the technique of using heat and
pressure are tailored to fit different ingredients and objectives.
Dave Albin, Insta-Pro
International's director of nutri-
tion and extrusion technologies,
explains that the different types of
extrusion technology are available
for a reason, which is to achieve a
"There is no one-size-fits-all
technology for the feed industry,"
he said. "Feed mills invest in extrusion technology to meet an end
goal, like increasing digestibility,
deactivating anti-nutritional factors and sterilizing."
Understanding how the equipment fits into a feed mill's equation is key.
Extrusion uses heat and pressure to break down anti-nutritional
factors, increase digestibility and improve feed hygiene.
Anderson International Corporation
Understanding the value in
For example, expanders utilize
the high heat and pressure treatment to precondition ingredients
before they enter a pelletizer.
"The expander serves as a
multipurpose tool by hygienizing
the feed, modifying the starch and
increasing the metabolizable energy," said Mitch Gorski, president
of Amandus Kahl USA. "This allows for efficient pellet production
and greater optimization of the
The expander modifies the
starch and helps bind ingredients
together to make a better pellet
that doesn't crumble easily during
The expander is also suitable for
producing a structurized individual feed mixture that is free from
pathogenic germs, easily dissolves
in water and has very good flow
properties for easy discharge from
silo cells or automatic feeders.
"Expanded structurized feed is
a compound feed that has been exposed to hydrothermal treatment
by an expander and which has
www.WATTAgNet.com ❙ January 2018