Abstract / Description of output
Thirty-eight sheep flocks, predominantly from the south/central Scotland, were examined using a faecal egg count reduction test (FECRT) for the presence of ivermectin (IVM) resistant nematodes. Efficacies of less than 95%. 14-17 days post-treatment, were identified in 6 of 17 naturally grazing flocks where pre-treatment faecal egg counts were in excess of 150 eggs per gram. Efficacies on these IVM resistant farms ranged from 66 to 92%. One other suspected cases of IVM resistance was also identified in returned material. The larvae detected in post-treatment coprocultures from resistant flocks were from the genera Teladorsagia (4 from 6) and Trichostrongylus (2 from 6). (C) 2005 Elsevier B.V. All rights reserved.
Original language | English |
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Pages (from-to) | 112-118 |
Number of pages | 7 |
Journal | Veterinary Parasitology |
Volume | 137 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 15 Apr 2006 |