{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T09:16:24Z","timestamp":1785402984813,"version":"3.56.0"},"reference-count":40,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T00:00:00Z","timestamp":1782345600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Lesaffre","award":["436940-00000"],"award-info":[{"award-number":["436940-00000"]}]},{"award":["436940-00000"],"award-info":[{"award-number":["436940-00000"]}],"id":[{"id":"https:\/\/ror.org\/00r23cm16","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Animals"],"abstract":"<jats:p>Saccharomyces cerevisiae yeast products are used to stabilize dairy cattle rumen environments. In this study, multiparous lactating Holstein\u2013Jersey cross cows in late lactation (n = 12; \u00b1150 DIM) were used in a replicated 4 \u00d7 4 Latin square design over four 21 d periods to evaluate yeast supplementation on dry matter intake (DMI), milk production, milk components, rumen pH, and redox potential (Eh). A subset of four ruminally cannulated cows were selected for rumen measurements. Treatments included no additive (CON), 14 g yeast culture additive (YCA), 5 g active dry yeast (ADY), and 5 g ADY + 5 g yeast extract additive (YEA) top-dressed once daily. Data were analyzed using GLIMMIX in SAS 9.4, with significance at p \u2264 0.05 and tendencies at p \u2264 0.15. Dry matter intake did not differ among treatments (p &gt; 0.15) but decreased over time (p &lt; 0.05). Milk production, efficiency, lactose, and total solids were not affected (p &gt; 0.15). YCA tended to increase milk fat and fatty acid fractions compared with CON (p &lt; 0.15). Protein in milk was greater in CON (p &lt; 0.05; p &lt; 0.05) than YCA and YEA. Active dry yeast treatments increased the frequency of a buffered rumen (p &lt; 0.05) and promoted a more reducing ruminal environment, characterized by lower redox potential and conditions favorable for anaerobic fermentation (p &lt; 0.05). Overall, supplementing active dry yeasts to dairy cows in late lactation did not affect DMI, production efficiency, or milk quality, but may maintain rumen pH stability.<\/jats:p>","DOI":"10.3390\/ani16131970","type":"journal-article","created":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T00:49:23Z","timestamp":1782434963000},"page":"1970","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Yeast Additive Effects on Dry Matter Intake, Milk Production, Milk Composition, and Ruminal Metabolism in Lactating Dairy Cattle"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-1701-5540","authenticated-orcid":false,"given":"Michaela R.","family":"Plowman","sequence":"first","affiliation":[{"name":"Department of Animal Science, Tarleton State University, Stephenville, TX 76402, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1488-3118","authenticated-orcid":false,"given":"Barry D.","family":"Lambert","sequence":"additional","affiliation":[{"name":"Department of Animal Science, Tarleton State University, Stephenville, TX 76402, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1775-8072","authenticated-orcid":false,"given":"James P.","family":"Muir","sequence":"additional","affiliation":[{"name":"Department of Wildlife & Natural Resources, Tarleton State University, Stephenville, TX 76402, USA"},{"name":"Texas A&M AgriLife Research, Stephenville, TX 76401, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0653-2182","authenticated-orcid":false,"given":"Walter F.","family":"Owsley","sequence":"additional","affiliation":[{"name":"Department of Animal Science, Tarleton State University, Stephenville, TX 76402, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6165-6236","authenticated-orcid":false,"given":"Kimberly B.","family":"Wellmann","sequence":"additional","affiliation":[{"name":"Department of Animal Science, Tarleton State University, Stephenville, TX 76402, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"100298","DOI":"10.1016\/j.animal.2021.100298","article-title":"Review: Perspective on high-performing dairy cows and herds","volume":"15","author":"Britt","year":"2021","journal-title":"Animal"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"406","DOI":"10.1046\/j.1439-0442.2003.00569.x","article-title":"Subacute ruminal acidosis (SARA): A review","volume":"50","author":"Kleen","year":"2003","journal-title":"J. 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