{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,28]],"date-time":"2025-12-28T02:26:51Z","timestamp":1766888811940},"reference-count":27,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2014,8,24]],"date-time":"2014-08-24T00:00:00Z","timestamp":1408838400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Aust Veterinary J"],"published-print":{"date-parts":[[2014,9]]},"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p>Compare breech\u2010strike on Merino ewes and hoggets that were mulesed, had breech and tail clips applied (\u2018clipped\u2019) or left unmulesed and treated strategically with long\u2010acting insecticide.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design<\/jats:title><jats:p>A cohort study on two farms in southern Victoria.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Three treatment groups were established at lamb marking in 2008 and 2009 on each farm. The unmulesed group was treated with a long\u2010acting insecticide in early spring. The prevalence of breech\u2010strike and key risk factors, including presence of dag, urine stain and breech wrinkle, were compared between groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Breech\u2010strike was detected from <jats:styled-content style=\"fixed-case\">O<\/jats:styled-content>ctober to <jats:styled-content style=\"fixed-case\">D<\/jats:styled-content>ecember on 1.9% and 7.2% of mulesed, and on 14.8% and 12.5% of clipped ewes, respectively, on each farm. Thus, clipped ewes had a relative risk of breech\u2010strike 7.8\u2010 and 1.7\u2010fold that of mulesed ewes. Unmulesed ewes treated with insecticide had similar or less breech\u2010strike compared with mulesed ewes (3.4% and 1.4%), but significantly more dag, stain and breech wrinkle. From <jats:styled-content style=\"fixed-case\">J<\/jats:styled-content>anuary, breech\u2010strike on unprotected unmulesed ewes was 8.5% and 2.8%, compared with 3.5% and 0% on mulesed ewes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Early\u2010season treatment of unmulesed sheep prevented most breech\u2010strikes during spring and early summer on both hoggets and breeding ewes, confirming it as a short\u2010 to medium\u2010term option for the control of breech\u2010strike. Some benefits were associated with the use of clips but, to control breech\u2010strike, clipped sheep should be treated the same as unmulesed sheep. Genetic selection to reduce the prevalence of dag will be required for future strategies to control breech\u2010strike on Merino sheep in south\u2010eastern <jats:styled-content style=\"fixed-case\">A<\/jats:styled-content>ustralia.<\/jats:p><\/jats:sec>","DOI":"10.1111\/avj.12228","type":"journal-article","created":{"date-parts":[[2014,8,25]],"date-time":"2014-08-25T02:35:21Z","timestamp":1408934121000},"page":"348-356","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Breech\u2010strike on mulesed, clipped and unmulesed Merino ewes and hoggets in south\u2010eastern <scp>A<\/scp>ustralia"],"prefix":"10.1111","volume":"92","author":[{"given":"LD","family":"Tyrell","sequence":"first","affiliation":[{"name":"The Mackinnon Project University of Melbourne  250 Princes Hwy Werribee Victoria 3030 Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"JWA","family":"Larsen","sequence":"additional","affiliation":[{"name":"The Mackinnon Project University of Melbourne  250 Princes Hwy Werribee Victoria 3030 Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"N","family":"Anderson","sequence":"additional","affiliation":[{"name":"The Mackinnon Project University of Melbourne  250 Princes Hwy Werribee Victoria 3030 Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2014,8,24]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1751-0813.2012.00914.x"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1071\/EA05100"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1440-6055.2011.00835.x"},{"key":"e_1_2_7_5_1","unstructured":"Australian Wool Innovation Ltd and Meat and Livestock Australia.AWI visual sheep scores.2013.http:\/\/www.wool.com\/Content\/en\u2010GB\/Visual_Sheep_Scores_Researcher_Version_LR.pdfAccessed March 2014."},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1080\/00401706.1964.10490181"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1201\/9781420075779"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/0471722146"},{"key":"e_1_2_7_9_1","unstructured":"TyrellLD.A comparison of programs for the control of blowfly\u2010strike on Merino sheep in south\u2010eastern Australia. 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