title: Nematode control practices and anthelmintic resistance on British sheep farms.
abstract: Nearly 23 per cent of 3000 randomly selected sheep farmers returned questionnaires on strategies to control the development of anthelmintic resistance. Twenty-five per cent stated that they regularly checked the accuracy of their drenching gun, and 52 per cent stated that they weighed a few animals and treated the whole flock like the heaviest. The mean annual frequency of dosing lambs was 4.39 compared with 2.43 for ewes. Forty-eight per cent stated that they changed the anthelmintic group annually. Seventeen per cent always treated sheep brought on to their farm with ivermectin. However, only 7 per cent had had their flocks tested for anthelmintic-resistant nematodes. The responses suggest that most sheep farmers are not actively seeking to prevent the development and spread of anthelmintic-resistant nematodes.
authors.affiliation: Department of Clinical Veterinary Science, University of Bristol, Langford.
authors.forename: G C
authors.initials: GC
authors.lastname: Coles
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D000969:Antinematodal Agents / Q000008:administration & dosage / Q000494:pharmacology*; D003625:Data Collection; D004351:Drug Resistance; D004739:England; D009348:Nematoda / Q000187:drug effects* / Q000472:pathogenicity; D009349:Nematode Infections / Q000517:prevention & control / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000517:prevention & control*
chemical_list: D000969:Antinematodal Agents