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Yuxin Shao,Zhao Lei,Jianmin Yuan,Ying Yang,Yuming Guo,Bingkun Zhang 한국미생물학회 2014 The journal of microbiology Vol.52 No.12
To evaluate the effects of supplemental zinc on growth performance,gut morphometry, and the cecal microbial communityin broilers challenged with Salmonella typhimurium,180, 1-day-old male Cobb 500 broiler chicks were randomlyassigned to 3 treatments with ten replicates for a 42 day experiment. The 3 treatments were: unchallenged, S. typhimurium-challenged, and S. typhimurium-challenged with 120mg/kg of zinc supplementation in the diet. Salmonella infectioncaused a reduction in body-weight gain and feed intake,disrupted the intestinal structure by decreasing thevillus-height/crypt-depth ratio of the ileum and increasingthe apoptotic index of ileal epithelial cells. Moreover, thececal microbial community was altered by Salmonella infection,as demonstrated by a reduced number of Lactobacillusand total bacteria. Dietary zinc supplementation improvedgrowth performance by increasing the body-weight gainand feed intake in the challenged broilers. In addition, zincrepaired intestinal injury by reducing the apoptotic index ofileal epithelial cells, enhancing villus height and the villusheight/crypt-depth ratio of the ileum, and the proliferationindex of ileal epithelial cells. Finally, zinc regulated the cecalmicrobial community by increasing the number of total bacteriaand beneficial Lactobacillus bacteria, and reducing thenumber of Salmonella. The results indicated that dietaryzinc supplementation improved growth performance, intestinalmorphology, and intestinal microbiota in S. typhimurium-challenged broilers.
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