Feed Strategy - January 2018 - 27
FeedStrategy ❙ 27
been produced without pelleting
as granulate for direct feeding,"
Expanded structurized feed is
used for dairy cattle and feedstock
when feeding a total mixed ration
(TMR) diet including roughage
and/or silage in the mixing trough
or when producing a starch modified individual component such as
sorghum, corn, barley or wheat.
Expanded structurized feed is not
as hard as pellets, so it does not
damage the gullet or the stomach.
Extruders utilize the same heat
and pressure method as expanders
- but they go one step further to
produce a finished product.
"The extruder could be thought
of as an expander and a pellet mill
in one machine," said Spencer
Lawson, Wenger Universal pelletizer cooker technology manager.
Extruders have a die at the end
of the machine that produces the
shape of the feed.
Lawson said extruders can also
handle a wider variety of ingredients.
"Since extrusion is a total different process, we don't have as
much of a challenge manufacturing together rations with ingredients that are typically difficult
to manufacture utilizing a pelletizer," he said. This gives nutritionists more ingredient flexibility
when they're putting together
How extrusion works
While the equipment varies
depending on a feed mill's target
January 2018 ❙ www.WATTAgNet.com
market, size and end goals, the
proven process of using heat and
pressure to increase digestibility
is the same for expanders and
Eric Stibora, a chemical en-
gineer at Anderson International
Corporation, said the process
involves feeding pre-ground, preheated, and pre-mixed material at
a continuous and constant rate into
the feed hopper of the extruder.
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