{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T15:29:41Z","timestamp":1789140581910,"version":"build-2803163510"},"reference-count":70,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2022,1,20]],"date-time":"2022-01-20T00:00:00Z","timestamp":1642636800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the China Agriculture Research System","award":["CARS-41"],"award-info":[{"award-number":["CARS-41"]}]},{"name":"the Agricultural Science and Technology Innovation Program","award":["CAAS-ZDRW202006-02"],"award-info":[{"award-number":["CAAS-ZDRW202006-02"]}]},{"name":"the Agricultural Science and Technology Innovation","award":["ASTIPIAS07"],"award-info":[{"award-number":["ASTIPIAS07"]}]},{"DOI":"10.13039\/501100011364","name":"State Key Laboratory of Animal Nutrition","doi-asserted-by":"publisher","award":["2004DA125184G2102"],"award-info":[{"award-number":["2004DA125184G2102"]}],"id":[{"id":"10.13039\/501100011364","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Antibiotics"],"abstract":"<jats:p>The purpose of this study was to investigate the effects of chemically protected sodium butyrate (CSB) on growth performance and the early development and function of small intestine in broilers as one potential substitute for antibiotics. A total of 192 one-day-old Arbor Acres male broilers were randomly assigned into three dietary treatment groups (eight replicates per treatment): the control (CON) diet; ANT diet, CON diet supplemented with the antibiotics (enramycin, 8 mg\/kg and aureomycin, 100 mg\/kg); CSB diet, CON diet supplemented with 1000 mg\/kg CSB, respectively. The results showed that dietary CSB and antibiotics addition significantly improved the growth performance of broilers by increasing the body weight gain (BWG) and feed conversion ratio (FCR) during different stages (p &lt; 0.05). On day 21, the supplement of CSB in diet improved the structure of small intestine (duodenum, jejunum, and ileum) in broilers by increasing the ratio of villus height to crypt depth (VH\/CD) (p &lt; 0.05) and enhanced the butyric acid (BA) (p &lt; 0.05) and total short chain fatty acids (SCFA) concentrations of small intestine (jejunum and ileum) compared with the CON and ANT diets. Besides that, the superoxide dismutase (SOD), total antioxidant capacity (TAC) and TAC to malondialdehyde (TAC\/MDA) ratio of the ileal and jejunal mucosa were significantly higher (p &lt; 0.05) in the CSB and ANT than in the CON. In addition, the supplement of CSB in diet markedly significantly enhanced \u03b1-amylase, lipase, and trypsin activities of the ileum (p &lt; 0.05) as compared to the ANT diet. 16S rRNA gene sequencing indicated that CSB markedly increased the microbiota diversity of ileum in broilers at 21 days of age as compared to CON and ANT (p &lt; 0.05). Furthermore, we found that Firmicutes was the predominant phyla and Lactobacillus was the major genus in the ileum of broilers. Compared with the ANT diet, the supplement of CSB in diet increased the relative abundance of some genera microbiota (e.g., Candidatus_Arthromitus, Romboutsia) by decreasing the relative abundance of Lactobacillus. Moreover, Akkermansia in the CSB was the highest in comparison to that in the CON and ANT. In addition, Kitasatospora that belongs to the phylum Actinobacteriota was only found in ileum of broilers fed the ANT diet. In summary, the supplement of 1000 mg\/kg CSB in the diet improved the growth performance by promoting early development and function of the small intestine, which is associated with the regulation of intestinal flora and reestablishment of micro-ecological balance in broilers. Thus, CSB has great potential value as one of effective substitutes for in-feed antibiotics in the broiler industry.<\/jats:p>","DOI":"10.3390\/antibiotics11020132","type":"journal-article","created":{"date-parts":[[2022,1,20]],"date-time":"2022-01-20T22:40:20Z","timestamp":1642718420000},"page":"132","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":42,"title":["Chemically Protected Sodium Butyrate Improves Growth Performance and Early Development and Function of Small Intestine in Broilers as One Effective Substitute for Antibiotics"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5979-2055","authenticated-orcid":false,"given":"Huaibao","family":"Zhao","sequence":"first","affiliation":[{"name":"State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hai","family":"Bai","sequence":"additional","affiliation":[{"name":"School of Life Science, Shanxi Datong University, Datong 037000, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fuli","family":"Deng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0494-6699","authenticated-orcid":false,"given":"Ruqing","family":"Zhong","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liang","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongfu","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,1,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"149","DOI":"10.1080\/00071660120048375","article-title":"Responses to Heat Stress in Commercial and Local Broiler Stocks. 1. 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