{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,3]],"date-time":"2026-04-03T03:54:46Z","timestamp":1775188486841,"version":"3.50.1"},"reference-count":51,"publisher":"Oxford University Press (OUP)","license":[{"start":{"date-parts":[[2024,2,24]],"date-time":"2024-02-24T00:00:00Z","timestamp":1708732800000},"content-version":"vor","delay-in-days":54,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,1,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Subacute ruminal acidosis (SARA) is characterized by chronic low ruminal pH, and occurs for feedlot cattle fed high-concentrate diets. Forages slow digestion and reduce acid production. We aimed to assess how motivated finishing cattle are to access forage (Sudan grass hay, SG) via their willingness to interact with an electrified barrier. Reticulorumen pH was measured to relate the results to digestive health. Twenty-eight animals fed a high-concentrate ration ad libitum had access to 4\u00a0L of one of two treatments (n\u2005=\u200514\/treatment) fed 1\u00d7\/d behind a barrier: 1) SG or 2) an additional offering of the normal ration (total mixed ration [TMR]). To access their treatment, the steer voluntarily pushed his muzzle against an electrified barrier. The electrical current was increased exponentially every 24\u00a0h (0, 156, 312, 625, 1,250, 2,500, 5,000 \u00b5A) until the animal ceased accessing it. Visits to the treatment were recorded continuously 24\u00a0h\/d and reticulorumen pH was measured every 10\u00a0min. Time with a reticulorumen pH below 5.8 was 348 \u00b1 101 and 280 \u00b1 76 min\/24 h for SG and TMR animals, respectively; these durations meet the criterion for SARA. However, animals with access to SG were less likely to advance to the next current than TMR animals (P\u2005&amp;lt;\u20050.01) and were approximately 3\u00d7 less willing to interact with higher currents than TMR (mean maximum current touched: 469\u2005\u00b1\u2005169 and 1,380\u2005\u00b1\u2005254 \u03bcA, respectively, mean\u2005\u00b1\u2005SE, P\u2005=\u20050.01). Lower motivation to access SG was further demonstrated through fewer visits to the SG (2.4\u2005\u00b1\u20050.4 vs. 5.3\u2005\u00b1\u20050.6 #\/d, P\u2005&amp;lt;\u20050.01), and less SG consumed than TMR (32.0\u2005\u00b1\u20050.1 vs. 74.0\u2005\u00b1\u20050.0 %\/d, P\u2005&amp;lt;\u20050.01, measured as % due to weight differences of SG and TMR). Overall, finishing cattle valued the TMR more than SG, likely because of differences in the quantity offered, palatability, and familiarity. When rumen health was considered, SG animals visited more often (r\u2005=\u20050.5, P\u2005=\u20050.09) and showed fewer failed attempts (r\u2005=\u2005\u22120.5, P\u2005=\u20050.06) to access forage as the severity and duration of pH depression below 5.6, for example, increased. No measures of treatment use were related to pH depression for TMR animals (P\u2005\u2265\u20050.31). These findings provide evidence that cattle are motivated for Sudan grass hay when experiencing chronic low reticulorumen pH. However, they also contribute to the mixed evidence about the motivation for forage in this life stage, because, overall TMR was valued more highly than SG. Despite widespread pH depression, TMR cattle contrafreeloaded for additional concentration, demonstrating unexpectedly high motivation for this resource.<\/jats:p>","DOI":"10.1093\/jas\/skae049","type":"journal-article","created":{"date-parts":[[2024,2,24]],"date-time":"2024-02-24T19:31:03Z","timestamp":1708803063000},"source":"Crossref","is-referenced-by-count":2,"title":["Cattle are more motivated for a high-concentrate diet than Sudan grass hay, despite low reticulorumen pH"],"prefix":"10.1093","volume":"102","author":[{"given":"Rachael E","family":"Coon","sequence":"first","affiliation":[{"name":"Center for Animal Welfare, Department of Animal Science, University of California, Davis , Davis, CA 95618 , USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6014-444X","authenticated-orcid":false,"given":"Cassandra B","family":"Tucker","sequence":"additional","affiliation":[{"name":"Center for Animal Welfare, Department of Animal Science, University of California, Davis , Davis, CA 95618 , USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2024,2,24]]},"reference":[{"key":"2024032119135244400_CIT0001","doi-asserted-by":"crossref","first-page":"1447","DOI":"10.3168\/jds.S0022-0302(97)76074-0","article-title":"Relationship between fermentation acid production in the rumen and the requirement for physically effective fiber","volume":"80","author":"Allen","year":"1997","journal-title":"J. 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