Sustained-release Famphur Bolus for Control of Boophilus Ticks12

Abstract
When cattle were infused with famphur via rumen cannulae and challenged with several 1-host ticks, 3 mg famphur/kg body wt/day was ineffective against Boophilus annulatus (Say), B. microplus (Canestrini) and Dermacentor albipictus (Packard), but 5 mg/kg was highly effective against the 2 Boophilus spp. while giving no control of D. albipictus. Administration of famphur in a sustained-release bolus resulted in complete control of Boophilus when the insecticide was administered to cattle at an average daily dose of 6.82 mg famphur/kg animal body wt.