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The results showed that both RA and Abx supplementation promoted growth and improved the nutrient absorption and barrier function. However, Abx caused negative effects including reduced jejunal and ileal lengths, impaired immune organs, suppressed ileal immunoglobulins, reduced short-chain fatty acids (SCFAs) concentrations, and promoted drug-resistant bacterial proliferation. However, RA supplementation demonstrated superior beneficial effects by enhancing intestinal morphology, enriching cecal beneficial bacteria, and elevating SCFAs production.<\/jats:p>","DOI":"10.1093\/jas\/skaf323","type":"journal-article","created":{"date-parts":[[2025,9,15]],"date-time":"2025-09-15T11:32:13Z","timestamp":1757935933000},"source":"Crossref","is-referenced-by-count":9,"title":["The effects of rosmarinic acid and antibiotics on the intestinal morphology, function, and cecal microbiota of broiler chickens"],"prefix":"10.1093","volume":"103","author":[{"given":"Xuedong","family":"Ding","sequence":"first","affiliation":[{"name":"National Center for International Research on Animal Gut Nutrition, Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health, Laboratory of Gastrointestinal Microbiology, National Experimental Teaching Demonstration Center of Animal Science, College of Animal Science and Technology, Nanjing Agricultural University , Nanjing 210095,","place":["P. 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