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PHYTASE FACT SHEET Phytase - An enzyme that breaks down the
undigestable phytic acid (phytate) portion
in grains and oil seeds; thereby, releasing digestible
phosphorus and calcium for thepig.
tudies ha!e indicated that the inclusion of phytase in swine
diets has increased the
a!ailability of phytate phosphorus in a corn-soy diet from
appro"imately #$% to&$%.
Phytase acti!ity is e"pressed as 'phytase units' or '*' per unit
of feed (i.e. -
*+kg or *+lb.) * is a worldwide standard unit.
ne phytase unit is the acti!ity of phytase that generates #
micromole of inorganic
phosphorus per minute from an e"cess of sodium phytate at p $.$
and / degrees0elsius.
1anufacturers of Phytase2
3A - (4atuphos 566a+dry, 4atuphos $666a+dry 7 li8uid, and
4atuphos#666a+dry -9a: *+gram)Alltech, >/ *+lb. or a
corn-soy diet without supplemental fat, the inclusion rate would
be appro"imately##$ to #$6 *+lb. A diet with a significant amount
of supplemental fat should beincreased to appro"imately #$6 to
>>/ *+lb. *se a higher inclusion rate in theinitial diet
phase and decrease the rate o!er the duration of the phases. At
theseinclusion rates, the total phosphorus le!el can be reduced
appro"imately #6%.
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3ecause of the heat and moisture associated with pelleting,
enzymes are destroyed;
therefore, the phytase stability in pelleted diets should be
considered. 0onse8uently,when phytase is added to a pelleted diet,
spraying a li8uid phytase product onto thecooled pellet will allow
stability of the phytase.
@"ample diets with and without phytase inclusion for mi"ed se"
pigs weighing #6
to #6 lbs.
Ingredient* No Phytase (lbs.) With Phytase (lbs.) With Phytase
(lbs
0orn, yellow #5>$.$ #5&6.5> #5&$
oybean 1eal, &% 6 >> >>
Bimestone (0alcium 0arbonate) #. #C #C.
Dicalcium Phosphate #$.# / >.>$
alt+Eitamin+race 1ineral ##.>$ ##.>$ ##.>$
Phytase - 3A 4atuphos $666** 6.66 6.# 6.>6
otal lbs. >666 >666 >666
-----------------------------------------
------------------------- -------------------------
-----------------------
Bysine, % 6./# 6./# 6./#0rude Protein, % #&. #&.&
#&.$
1etabolizable energy, kcal+lb. #$6> #$#$ #$>
0alcium, % 6.$ 6.$ 6.$
otal Phosphorus, % 6.&/ 6.&6 6.$
A!ailable phosphorus, % 6.>6 6.>6 6.>6
Phytase - *+lb. 6.66 #$6 >>/
0ost of the diet F##>./ F##>.5# F##>.5$
*.66+bu., oybean 1eal : F#C6.66+ton, Dicalcium Phosphate:
F>6.66+ton, Phytase : F.66+lb.
**he phytase product is for e"ample only, not necessarily a
recommendation.
he addition of (6.# lbs.) phytase at the inclusion le!el of #$6
*+lb. will replace
.# lbs. of dicalcium phosphate. ?ith the ma"imum addition of
(6.>6 lbs.) phytase atthe inclusion le!el of >>/ *+lb., a
replacement of #>.$ lbs. of dicalciumphosphate can be
achie!ed.
Prepared by Barry G. 1c1ullen,
