{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,12]],"date-time":"2026-07-12T23:06:03Z","timestamp":1783897563323,"version":"3.55.0"},"reference-count":42,"publisher":"Oxford University Press (OUP)","license":[{"start":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T00:00:00Z","timestamp":1782864000000},"content-version":"vor","delay-in-days":181,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"name":"Saskatchewan\u2019s Agriculture Development Fund","award":["20150268"],"award-info":[{"award-number":["20150268"]}]},{"DOI":"10.13039\/100008920","name":"University of Saskatchewan","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100008920","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005019","name":"Beef Cattle Research Council","doi-asserted-by":"publisher","award":["ANH.04.17"],"award-info":[{"award-number":["ANH.04.17"]}],"id":[{"id":"10.13039\/501100005019","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,1,15]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>A randomized controlled trial determined the effects of anthelmintic treatments on growth and production performance, and carcass quality in western Canadian feedlot cattle. Fall-weaned, auction-derived steers (n\u2009=\u2009234) were randomly assigned to three groups: untreated control (CTRL), injectable ivermectin (IVM), and injectable ivermectin combined with oral fenbendazole (IVM\u2009+\u2009FZ). Steers were dosed according to individual body weights and manufacturers\u2019 recommendations. Individual fecal and blood samples were collected at feedlot arrival to determine fecal egg counts (FEC) and serum O. ostertagi antibody titers. The effects of anthelmintic treatments on live body weights (BW), dry matter intake, average daily gain (ADG), gain-to-feed ratio, and carcass quality characteristics were analyzed at the pen level. Individual FEC and serum O. ostertagi titers were used to estimate effects of gastrointestinal nematode infection intensity on growth, production, and carcass traits at the steer level. Live BW (P\u2009\u2265\u20090.46), dry matter intake (P\u2009\u2265\u20090.48), ADG (P\u2009\u2265\u20090.60), and gain-to-feed ratio (P\u2009\u2265\u20090.36) were not associated with anthelmintic treatments in either the backgrounding (day 0\u201328) or finishing (days 29\u2013177) phase. Hot carcass weight (P\u2009=\u20090.97), dressing percentage (P\u2009=\u20090.41), backfat thickness (P\u2009=\u20090.33), and rib-eye area (P\u2009=\u20090.97) also showed no differences between treatments. The IVM\u2009+\u2009FZ treatment increased the proportion of carcasses with modest marbling compared with CTRL and IVM (P\u2009=\u20090.002) and tended to produce more AAA carcasses than CTRL (P\u2009=\u20090.06), whereas IVM alone increased the proportion of yield grade 2 carcasses compared with the other treatments (P\u2009=\u20090.006). Higher FEC at arrival (mean 9.1\u2009\u00b1\u200910.2 eggs per g of feces) were associated with lower ADG during the finishing phase (P\u2009=\u20090.01), reduced hot carcass weight (P\u2009=\u20090.03), and a lower percentage of AAA carcasses (P\u2009=\u20090.02). Increasing serum O. ostertagi titers were linked to thinner backfat (P\u2009=\u20090.004) and a greater proportion of yield grade 1 carcasses compared to fatter yield grades (P\u2009=\u20090.04). The results indicate that anthelmintics used in western Canada improved certain beef cattle carcass qualities and that relatively low gastrointestinal nematode burdens may still be associated with measurable adverse impacts on feedlot performance under these conditions.<\/jats:p>","DOI":"10.1093\/tas\/txag087","type":"journal-article","created":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T15:55:18Z","timestamp":1782921318000},"source":"Crossref","is-referenced-by-count":0,"title":["Effects of anthelmintics and gastrointestinal nematode infection intensity on growth and production performance and carcass quality in western Canadian feedlot cattle"],"prefix":"10.1093","volume":"10","author":[{"given":"Eranga L","family":"De Seram","sequence":"first","affiliation":[{"name":"Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan , Saskatoon, SK, S7N 5B4,","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6396-2130","authenticated-orcid":false,"given":"Gregory B","family":"Penner","sequence":"additional","affiliation":[{"name":"Department of Animal and Poultry Science, College of Agriculture and Bioresources, University of Saskatchewan , Saskatoon, SK, S7N 5A8,","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John R","family":"Campbell","sequence":"additional","affiliation":[{"name":"Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan , Saskatoon, SK, S7N 5B4,","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sarah E","family":"Parker","sequence":"additional","affiliation":[{"name":"Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan , Saskatoon, SK, S7N 5B4,","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John S","family":"Gilleard","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, Host-Parasite Interactions Program, University of Calgary , Calgary, AB, T2N 4Z6,","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Colleen M","family":"Pollock","sequence":"additional","affiliation":[{"name":"Merck Animal Health , Kirkland, Quebec, H9H 4M7,","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samantha","family":"Ekanayake","sequence":"additional","affiliation":[{"name":"Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan , Saskatoon, SK, S7N 5B4,","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0960-7007","authenticated-orcid":false,"given":"Fabienne D","family":"Uehlinger","sequence":"additional","affiliation":[{"name":"Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan , Saskatoon, SK, S7N 5B4,","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2026,7,1]]},"reference":[{"key":"2026071201313511500_txag087-B1","doi-asserted-by":"publisher","first-page":"273","DOI":"10.1093\/tas\/txy115","article-title":"Effects of extended-release eprinomectin on productivity measures in cow\u2013calf systems and subsequent feedlot performance and carcass characteristics of calves","volume":"3","author":"Andresen","year":"2019","journal-title":"Transl. 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