520.2087—Roxarsone soluble powder.
(a) Specifications.
Each ounce (avoirdupois) of soluble powder contains 21.7 grams of roxarsone (monosodium 3-nitro-4-hydroxyphenylarsonate).
(d) NAS/NRC status.
These conditions of use are NAS/NRC reviewed and found effective. NADA's for these uses need not include effectiveness data as specified by § 514.111 of this chapter, but may require bioequivalency and safety information.
(e) Conditions of use—
(1) Growing chickens and growing turkeys—
0.002 percent roxarsone in drinking water (one packet per each 250 gallons of drinking water).
(ii) Indications for use.
For increased rate of weight gain, improved feed efficiency, and improved pigmentation.
(iii) Limitations.
Administer continuously throughout growing period. Withdraw 5 days before slaughter. Use as sole source of organic arsenic.
(2) Swine—
(i) Amount.
0.01 percent roxarsone in drinking water (one packet per each 50 gallons of drinking water); or 30 milliliters of a 1.55 percent roxarsone solution (one packet per 3 pints of water) per 50 pounds of body weight as a drench.
(ii) Indications for use.
As an aid in the treatment of swine dysentery (hemorrhagic enteritis or bloody scours).
(iii) Limitations.
Administer drinking water continuously for not more than 6 days. Administer drench once daily for 1 or 2 days. If no improvement is observed, consult a veterinarian. Treatment may be repeated after 5 days. Withdraw 5 days before slaughter. Use as sole source of organic arsenic.