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Twenty-four Angus cow\u2013calf pairs were allocated to six 3.6-ha paddocks (four pairs\/paddock), randomly assigned to Control (Ctrl; n\u2009=\u20093) or Tannin treatment (TT; n\u2009=\u20093). Animals received 1\u2009kg\/cow\/day of dried distillers\u2019 grains with solubles (DDGS), with TT receiving an additional 0.4% tannins (2:1 condensed: hydrolizable). Grazing occurred during four 15-day periods (July\u2013September) across two years using the same 24 cows. Foraging behavior classified using hierarchical Hidden Markov Models (HMM), and, along with habitat\u2013resource use and targeted UPLC\u2013MS\/MS metabolomic data, were analyzed using mixed-effects models. Grazing behaviors classified using hierarchical HMM achieved 97% accuracy for state and 86.2% for behavioral-state classification. Tannin supplementation did not affect diel or collar-derived thermal exposure patterns (P\u2009&amp;gt;\u20090.05) but increased walking-to-grazing transitions (P\u2009=\u20090.04), enhancing foraging continuity as grazing peaked from dusk, while resting and rumination remained stable. TT cattle moved more toward water and supplement, used more NDVI-rich patches, even within steeper slopes (differences\u2009=\u20090.33, 1.10, and 0.41\u2009\u00b1\u20090.005; P\u2009&amp;lt;\u20090.04, respectively). Although no overall treatment differences were detected in metabolite concentrations after Benjamini\u2013Hochberg FDR adjustment (FD P\u2009&amp;gt;\u20090.05), Random Forest permutation-importance ranking (RFPI) identified hydroxytyrosol 4-O-glucoside, DIMBOA, 7,8-dihydroxyflavone, and catechin gallate as the strongest exploratory predictors of tannin exposure (RFPI scores &amp;gt; 0.05). These metabolites are associated with antioxidant activity, microbial transformation, and nitrogen-related metabolism, suggesting potential metabolic responses to protein\u2013tannin supplementation. This adaptation improved nutrient use, selective grazing, and terrain exploration, linking metabolism and foraging behavior to promote beef cattle performance and rangeland sustainability.<\/jats:p>","DOI":"10.1093\/jas\/skag187","type":"journal-article","created":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T05:26:22Z","timestamp":1781501182000},"source":"Crossref","is-referenced-by-count":0,"title":["Tannin supplementation modulates the grazing behavior and metabolomic profiles of beef cattle"],"prefix":"10.1093","volume":"104","author":[{"given":"Bashiri Iddy","family":"Muzzo","sequence":"first","affiliation":[{"name":"Department of Wildland Resources, S.J. & Jessie E. Quinney College of Agriculture and Natural Resources, Utah State University , Logan, UT 84322-5230,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Melissa S","family":"Chelak","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Faculty of Arts & Science, University of Lethbridge , Lethbridge, AB T1K 3M4,","place":["Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lamis","family":"Ali","sequence":"additional","affiliation":[{"name":"Department of Nutrition, Dietetics, and Food Science, S.J. & Jessie E. Quinney College of Agriculture and Natural Resources, Utah State University , Logan, UT 84322-5230,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kelvyn","family":"Bladen","sequence":"additional","affiliation":[{"name":"Department of Mathematics and Statistics, College of Arts & Sciences, Utah State University , Logan, UT 84322-3900,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Muhammad","family":"Ahsin","sequence":"additional","affiliation":[{"name":"Department of Nutrition, Dietetics, and Food Science, S.J. & Jessie E. Quinney College of Agriculture and Natural Resources, Utah State University , Logan, UT 84322-5230,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marina","family":"Carbonell-Herrera","sequence":"additional","affiliation":[{"name":"Department of Nutrition, Dietetics, and Food Science, S.J. & Jessie E. Quinney College of Agriculture and Natural Resources, Utah State University , Logan, UT 84322-5230,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephan","family":"Van Vliet","sequence":"additional","affiliation":[{"name":"Department of Nutrition, Dietetics, and Food Science, S.J. & Jessie E. Quinney College of Agriculture and Natural Resources, Utah State University , Logan, UT 84322-5230,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kezia R","family":"Manlove","sequence":"additional","affiliation":[{"name":"Department of Wildland Resources, S.J. & Jessie E. Quinney College of Agriculture and Natural Resources, Utah State University , Logan, UT 84322-5230,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R","family":"Douglas Ramsey","sequence":"additional","affiliation":[{"name":"Department of Wildland Resources, S.J. & Jessie E. 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