{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T13:46:19Z","timestamp":1775742379756,"version":"3.50.1"},"reference-count":36,"publisher":"American Veterinary Medical Association (AVMA)","issue":"12","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["ajvr"],"published-print":{"date-parts":[[2011,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n<jats:p><jats:bold>Objective<\/jats:bold>\u2014To characterize the impact of <jats:italic>Mannheimia haemolytica<\/jats:italic> infection on feed intake and weight gain in feedlot heifers and to evaluate the clinical efficacy of isoflupredone acetate administered in combination with oxytetracycline.<\/jats:p>\n<jats:p><jats:bold>Animals<\/jats:bold>\u201496 weanling heifers in a research feedlot facility.<\/jats:p>\n<jats:p><jats:bold>Procedures<\/jats:bold>\u2014Bronchopneumonia was induced by intrabronchial infusion of <jats:italic>M haemolytica<\/jats:italic>. Control heifers underwent a sham procedure. Infected heifers were treated with oxytetracycline alone or in combination with isoflupredone acetate (OXY-ISO) or with nothing. Clinical variables were recorded daily for 7 days following disease induction, and feedlot performance indices were measured over a 12-week period.<\/jats:p>\n<jats:p><jats:bold>Results<\/jats:bold>\u2014Infection caused a reduction in dry-matter intake and average daily gain (ADG) in heifers that received no treatment. Oxytetracycline treatment alone did not prevent reductions in feed intake and ADG during the first week after infection was induced, whereas OXY-ISO treatment did prevent these reductions. Treatment with OXY-ISO also resulted in faster clinical improvement. No significant differences were evident between the oxytetracycline and OXY-ISO groups with respect to dry-matter intake or ADG throughout the study period.<\/jats:p>\n<jats:p><jats:bold>Conclusions and Clinical Relevance<\/jats:bold>\u2014Isoflupredone acetate appeared to be a useful clinical adjunct to treatment with oxytetracycline in cattle with acute <jats:italic>M haemolytica<\/jats:italic> bronchopneumonia.<\/jats:p>","DOI":"10.2460\/ajvr.72.12.1613","type":"journal-article","created":{"date-parts":[[2011,11,30]],"date-time":"2011-11-30T19:52:22Z","timestamp":1322682742000},"page":"1613-1621","source":"Crossref","is-referenced-by-count":6,"title":["Impact of isoflupredone acetate treatment on clinical signs and weight gain in weanling heifers with experimentally induced Mannheimia haemolytica bronchopneumonia"],"prefix":"10.2460","volume":"72","author":[{"given":"Joanne","family":"Hewson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laurent","family":"Viel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeff L.","family":"Caswell","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patricia E.","family":"Shewen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jock G.","family":"Buchanan-Smith","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1272","reference":[{"key":"ref1","series-title":"Vet Clin N Am Food Anim Pract","doi-asserted-by":"publisher","first-page":"367","DOI":"10.1016\/S0749-0720(15)30302-9","article-title":"Economic impact associated with respiratory disease in beef 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