Title 21
SECTION 558.254
558.254 Famphur.
§ 558.254 Famphur.(a) Specifications. Type A medicated articles containing 13.2 or 33.3 percent famphur.
(b) Sponsor. See No. 000061 in § 510.600(c) of this chapter.
(c) Related tolerances. See § 556.273 of this chapter.
(d) Special considerations. Famphur is a cholinesterase inhibitor. Do not use this product in animals simultaneously or within a few days before or after treatment with or exposure to cholinesterase-inhibiting drugs, pesticides, or chemicals.
(e) Conditions of use. It is used in cattle feed as follows:
Table 2 - Size Proxies for SRCs in 2016
| Famphur in grams/ton | Indications for use | Limitations | Sponsor |
|---|---|---|---|
| (i) 1.1 milligrams per pound (mg/lb) body weight per day | Beef cattle and nonlactating dairy cows: For control of grubs and as an aid in control of sucking lice | Feed for 30 days. Withdraw from dry dairy cows and heifers 21 days prior to freshening. Withdraw 4 days prior to slaughter | 000061 |
| (ii) 2.3 mg/lb body weight per day | Beef cattle and nonlactating dairy cows: For control of grubs | Feed for 10 days. Withdraw from dry dairy cows and heifers 21 days prior to freshening. Withdraw 4 days prior to slaughter | 000061 |