Foodstuff Total P(%) Phytate (% of Total P)

Barley 0.34 56Corn 0.26 66Wheat 0.30 67Soybean meal 0.61 61Cottonseed meal 1.07 70Sesame meal 1.27 81Wheat bran 1.37 70

Adapted from Nelson et al. Poultry Sci. 47:1372 ‘68

Phytate P content of Major Swine Feeds

+ 6 H O 2

H

H

HH H

H

OH OH

OH

OH

OH

PhytaseH

H

H H

H

PhytateInositol

-OP OOO

=

-OP OOO

=

-OP OOO

=

Ca-

OP OOO

= -OP OOO

=

Mg-

OP OOO

=

-+

-+

Ca+ +

2Starch

NH3

CH2

Protein

Starch

+

ProteinStarchMineralsCH 0H

6 H PO3 4

- =

O

2O-C-CH -Protein

+ +

H

+

-

+

Action of Phytase

SmallIntestineDuodenum

Stomach

LiverPancreas

Cecum

Colon

Phytase produced in the salivary glands and

secreted in the saliva

Phytase

Phytate PhosphatePHOSPHATEPHOSPHATEABSORPTIONABSORPTION

IndigestiblePhytate phosphorusin the diet

Manure low in

Phosphorus

Phytate in a non-Transgenic pigPhytate in the Enviropig

How the EnviropigTM Works