[Code of Federal Regulations]
[Title 21, Volume 6]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR573.320]

[Page 501]
 
                        TITLE 21--FOOD AND DRUGS
 
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN 
                          SERVICES (CONTINUED)
 
PART 573--FOOD ADDITIVES PERMITTED IN FEED AND DRINKING WATER OF ANIMALS--Table of Contents
 
                    Subpart B--Food Additive Listing
 
Sec.  573.320  Diammonium phosphate.

    The food additive diammonium phosphate may be safely used in 
ruminant feed in accordance with the following prescribed conditions:
    (a) The food additive is the product resulting from the 
neutralization of feeding-phosphoric-acid or defluorinated wet-process 
phosphoric acid with anhydrous ammonia. It contains not less than 106.25 
percent equivalent crude protein (nitrogen x 6.25) and 20 percent 
phosphorus. It contains not more than the following:

1 part fluorine to 100 parts phosphorus.
75 parts per million or arsenic (as As).
30 parts per million of heavy metals, as lead (Pb).

    (b) It is used in ruminant feeds as a source of phosphorus and 
nitrogen in an amount that supplies not more than 2 percent of 
equivalent crude protein in the total daily ration.
    (c) To assure safe use of the additive, the label and labeling of 
the additive and that of any feed additive supplement, feed additive 
concentrate, feed additive premix, or complete feed prepared therefrom 
shall contain, in addition to other information required by the act, the 
following:
    (1) The name of the additive.
    (2) The maximum percentage of equivalent crude protein from the 
nonprotein nitrogen.
    (3) If the feed additive premix, feed additive concentrate, or feed 
additive supplement contains more than 2 percent equivalent crude 
protein from diammonium phosphate, adequate directions for use and a 
prominent statement, ``Warning--This feed should be used only in 
accordance with directions furnished on the label.''