| 摘要 |
An external device such as a ring, particularly an earring, for controlling cattle parasites and horn fly (Haematobia irritans) in particular, consisting of a matrix tha t includes 0.1-40 wt.%, preferably 2.5-10 wt.%, based on the weight of the earring, of an active substance that is at least one compound of formula (I), is disclosed. Said external device is designed to be effective for over 30 weeks.
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