Feed Strategy - February 2018 - 20
20 ❙ FeedStrategy
How to improve
New research has shown
positive effects on broiler
performance when a wide range
of NSP-degrading enzymes
are included in the diet.
ADRIANA TOSCAN AND
on-starch polysaccharides (NSPs) are the
main constituents of plant cell walls and
play a role in the encapsulation of nutrients including amino acids, starch and lipids. It is
well-known that NSPs negatively affect access of
endogenously secreted enzymes to their substrates,
Plant feed ingredients commonly used in poultry
diets contain between 7 and 19 percent of NSPs. Cereals
like wheat and barley and protein sources like soy contain a higher proportion of NSPs compared with corn.
However, the total NSP content of corn and wheat are
not so different, close to 90 grams per kilogram. The
major difference between corn and wheat NSPs is the
kind of arabinoxylan structures present in each.
Arabinoxylans from corn have a much more complex structure than arabinoxylans from wheat. They
are highly branched with multiple arabinose residue
substitutions in corn. A recent study showed that the
arabinose:xylose ratio (A:X) obtained for a corn-based
diet was higher than that obtained for a wheat-based
diet (0.73 vs. 0.65). This demonstrates a higher degree
of substitution in corn arabinoxylan chains (AX), compared with those in wheat.
BY ADDRESSING A WIDE range of chemical bonds present in
corn NSPs, the feedase concept has demonstrated significant
benefits on energy uplift and the release of other nutrients.
www.WATTAgNet.com ❙ February 2018