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In addition, the farmers\u2019 perceptions of helminths and anthelmintic efficacy were investigated. Most farmers (80%) treated prophylactically against nematodes, and 24% also used prophylactic treatment against <jats:italic>Fasciola hepatica<\/jats:italic>. Overall, few farmers (11%) used parasitological analysis as a tool to assess the timing of treatment, but rather based it on other factors such as previous experience (70%). In the surveyed sheep flocks, the use of benzimidazoles was reduced from 2018 (52%) to 2019 (47%) (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.01), whereas the use of macrocyclic lactones increased from 2017 (23%) to 2019 (36%) (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a00.001). Poor anthelmintic efficacy was suspected by 10% of the farmers, and 11% reported that helminths were an increasing problem in their flocks. The majority of farmers (72%) considered their veterinarian as the most important advisor for treatment of parasites, but reported a high level of uncertainty regarding which parasites were present in their flocks, with unknown status most frequently reported for <jats:italic>Haemonchus contortus<\/jats:italic> (71.5%). This is probably related to the fact that very few farmers (15%) regularly test their animals for parasites. The present study provides up-to-date information on treatment practices for helminths in Norwegian sheep flocks.<\/jats:p>","DOI":"10.1051\/parasite\/2021061","type":"journal-article","created":{"date-parts":[[2021,9,1]],"date-time":"2021-09-01T09:05:10Z","timestamp":1630487110000},"page":"63","source":"Crossref","is-referenced-by-count":15,"title":["Treatment against helminths in Norwegian sheep: a questionnaire-based survey"],"prefix":"10.1051","volume":"28","author":[{"given":"Maiken","family":"Gravdal","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5186-4421","authenticated-orcid":false,"given":"Lucy J.","family":"Robertson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristoffer R.","family":"Tysnes","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1129-6615","authenticated-orcid":false,"given":"Johan","family":"H\u00f6glund","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christophe","family":"Chartier","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Snorre","family":"Stuen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"250","published-online":{"date-parts":[[2021,9,1]]},"reference":[{"key":"R1","unstructured":"Animalia. 2013. 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