21 CFR § 558.254
Famphur
June 25, 2020
(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
Open Table
| 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 |
[84 FR 39185, Aug. 9, 2019]
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