| 摘要 |
The external device such as a ring, in particular an ear-ring, intended to eliminate cattle parasites, in particular Haematobia irritans, formed of a matrix including from 0.1 to 40%, preferably from 2.5 to 10%, by weight, relative to the ear-ring, of an active substance which is at least one compound of formula (I) below: <IMAGE> (I) this external device being designed to ensure efficacy for more than 30 weeks.
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