In animal nutrition, however, phytate has
long posed a challenge. Initially viewed as an
extremely valuable potential source of P
that could be made available through targeted
use of phytase feed enzymes, the
focus in recent years has shifted to the antinutrient
role phytate plays within the digestive
tract.
This anti-nutrient effect is substantial, and
clearly demonstrated by the significant
reductions in performance seen in Fig. 1,
where normal (high phytate) and genetically
modified (low phytate) cereals were compared
using 0 to 21-day-old broilers.
The phytate content in the unmodified
grains increased feed conversion ratio (FCR)
by 4.6% in the corn-based diets, and
reduced bodyweight gain (BWG) in the barley-based
diets by 5.0%.
There are several modes of action by
which phytate has this negative effect,
though all act to reduce digestibility and utilisation
of important nutrients supplied in the
diet. Key amongst these is the ability of the
phytate molecule to bind with both proteins
In animal nutrition, however, phytate haslong posed a challenge. Initially viewed as anextremely valuable potential source of Pthat could be made available through targeteduse of phytase feed enzymes, thefocus in recent years has shifted to the antinutrientrole phytate plays within the digestivetract.This anti-nutrient effect is substantial, andclearly demonstrated by the significantreductions in performance seen in Fig. 1,where normal (high phytate) and geneticallymodified (low phytate) cereals were comparedusing 0 to 21-day-old broilers.The phytate content in the unmodifiedgrains increased feed conversion ratio (FCR)by 4.6% in the corn-based diets, andreduced bodyweight gain (BWG) in the barley-baseddiets by 5.0%.There are several modes of action bywhich phytate has this negative effect,though all act to reduce digestibility and utilisationof important nutrients supplied in thediet. Key amongst these is the ability of thephytate molecule to bind with both proteins
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