{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T21:46:07Z","timestamp":1789595167361,"version":"build-2803163510"},"reference-count":49,"publisher":"Oxford University Press (OUP)","issue":"10","license":[{"start":{"date-parts":[[2019,8,14]],"date-time":"2019-08-14T00:00:00Z","timestamp":1565740800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"DOI":"10.13039\/100000057","name":"National Institute of General Medical Sciences","doi-asserted-by":"publisher","award":["1P20GM104320"],"award-info":[{"award-number":["1P20GM104320"]}],"id":[{"id":"10.13039\/100000057","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Nebraska Agricultural Experiment Station","award":["1009410"],"award-info":[{"award-number":["1009410"]}]},{"name":"Hatch Multistate Research capacity","award":["1011055"],"award-info":[{"award-number":["1011055"]}]},{"name":"Hatch Multistate Research capacity","award":["1009410"],"award-info":[{"award-number":["1009410"]}]},{"DOI":"10.13039\/100005825","name":"National Institute of Food and Agriculture","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100005825","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Nebraska Center for Prevention of Obesity Diseases","award":["1P20GM104320"],"award-info":[{"award-number":["1P20GM104320"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2019,10,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Feedlot performance is reduced by heat stress and improved by \u03b2 adrenergic agonists (\u03b2AA). However, the physiological mechanisms underlying these outcomes are not well characterized, and anecdotal reports suggest that \u03b2AA may confound the effects of heat stress on wellbeing. Thus, we sought to determine how heat stress and \u03b2AA affect growth, metabolic efficiency, and health indicators in lambs on a feedlot diet. Wethers (38.6 \u00b1 1.9 kg) were housed under thermoneutral (controls; n = 25) or heat stress (n = 24) conditions for 21 d. In a 2 \u00d7 3 factorial, their diets contained no supplement (unsupplemented), ractopamine (\u03b21AA), or zilpaterol (\u03b22AA). Blood was collected on days \u22123, 3, 9, and 21. On day 22, lambs were harvested and ex vivo skeletal muscle glucose oxidation was determined to gauge metabolic efficiency. Feet and organ tissue damage was assessed by veterinary pathologists. Heat stress reduced (P &amp;lt; 0.05) feed intake by 21%, final bodyweight (BW) by 2.6 kg, and flexor digitorum superficialis (FDS) muscle mass by 5%. \u03b22AA increased (P &amp;lt; 0.05) FDS mass\/BW by 9% and average muscle fiber area by 13% compared with unsupplemented lambs. Blood lymphocytes and monocytes were greater (P &amp;lt; 0.05) in heat-stressed lambs, consistent with systemic inflammation. Plasma insulin was 22% greater (P &amp;lt; 0.05) and glucose\/insulin was 16% less (P &amp;lt; 0.05) in heat-stressed lambs than controls. Blood plasma urea nitrogen was increased (P &amp;lt; 0.05) by heat stress on day 3 but reduced (P &amp;lt; 0.05) on days 9 and 21. Plasma lipase and lactate dehydrogenase were reduced (P &amp;lt; 0.05) by heat stress. Glucose oxidation was 17% less (P &amp;lt; 0.05) in muscle from heat-stressed lambs compared with controls and 15% greater (P &amp;lt; 0.05) for \u03b22AA-supplemented compared with unsupplemented lambs. Environment and supplement interacted (P &amp;lt; 0.05) for rectal temperature, which was increased (P &amp;lt; 0.05) by heat stress on all days but more so (P &amp;lt; 0.05) in \u03b22AA-supplemented lambs on days 4, 9, and 16. Heat stress increased (P &amp;lt; 0.05) the frequency of hoof wall overgrowth, but \u03b2AA did not produce any pathologies. We conclude that reduced performance in heat-stressed lambs was mediated by reduced feed intake, muscle growth, and metabolic efficiency. \u03b22AA increased muscle growth and improved metabolic efficiency by increasing muscle glucose oxidation, but no such effects were observed with ractopamine. Finally, \u03b2AA supplementation was not detrimental to health indicators in this study, nor did it worsen the effects of heat stress.<\/jats:p>","DOI":"10.1093\/jas\/skz271","type":"journal-article","created":{"date-parts":[[2019,8,15]],"date-time":"2019-08-15T02:16:29Z","timestamp":1565835389000},"page":"4101-4113","source":"Crossref","is-referenced-by-count":35,"title":["Hypertrophic muscle growth and metabolic efficiency were impaired by chronic heat stress, improved by zilpaterol supplementation, and not affected by ractopamine supplementation in feedlot lambs1"],"prefix":"10.1093","volume":"97","author":[{"given":"Taylor L","family":"Barnes","sequence":"first","affiliation":[{"name":"Department of Animal Science, University of Nebraska-Lincoln, NE"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caitlin N","family":"Cadaret","sequence":"additional","affiliation":[{"name":"Department of Animal Science, University of Nebraska-Lincoln, NE"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristin A","family":"Beede","sequence":"additional","affiliation":[{"name":"Department of Animal Science, University of Nebraska-Lincoln, NE"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ty B","family":"Schmidt","sequence":"additional","affiliation":[{"name":"Department of Animal Science, University of Nebraska-Lincoln, NE"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5438-8555","authenticated-orcid":false,"given":"Jessica L","family":"Petersen","sequence":"additional","affiliation":[{"name":"Department of Animal Science, University of Nebraska-Lincoln, NE"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dustin T","family":"Yates","sequence":"additional","affiliation":[{"name":"Department of Animal Science, University of Nebraska-Lincoln, NE"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2019,8,14]]},"reference":[{"key":"2020081320063694500_CIT0001","doi-asserted-by":"publisher","first-page":"4188","DOI":"10.2527\/jas.2011-3904","article-title":"Effects of zilpaterol hydrochloride on growth performance, carcass characteristics, and wholesale cut yield of hair-breed ewe lambs consuming feedlot diets under moderate environmental conditions","volume":"89","author":"Avenda\u00f1o-Reyes","year":"2011","journal-title":"J. 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