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Effect of a probiotic mixture on intestinal microflora, morphology, and barrier integrity of broilers subjected to heat stress

文献类型： 外文期刊

作者： Song, J.;Xiao, K.;Ke, Y. L.;Jiao, L. F.;Hu, C. H.;Zou, X. T.;Diao, Q. Y.;Shi, B.

作者机构：

关键词： probiotic;heat stress;intestinal microflora;intestinal barrier;broiler

期刊名称： POULTRY SCIENCE

ISSN： 0032-5791

年卷期： 2014 年 93 卷 3 期

页码：

收录情况： SCI

摘要： The current study investigated the efficacy of a probiotic mixture on ameliorating heat stress-induced impairment of intestinal microflora, morphology, and barrier integrity in broilers. The probiotic mixture contained Bacillus licheniformis, Bacillus subtilis, and Lactobacillus plantarum. Three hundred sixty 21-d-old Ross 308 male broilers were allocated in 4 experimental treatments, each of which was replicated 6 times with 15 broilers per replicate. A 2 x 2 factorial design was used in the study, and the main factors were composed of diet (basal diet or addition of 1.5 g/kg of probiotic mixture) and temperature (thermoneutral zone or heat stress). From d 22 to 42, birds were either raised in a thermoneutral zone (22 degrees C) or subjected to cyclic heat stress by exposing them to 33 degrees C for 10 h (from 0800 to 1800) and 22 degrees C from 1800 to 0800. Compared with birds kept in the thermoneutral zone, birds subjected to heat stress had reduced ADG and ADFI; lower viable counts of Lactobacillus and Bifidobacterium and increased viable counts of coliforms and Clostridium in small intestinal contents; shorter jejunal villus height, deeper crypt depth, and lower ratio of villus height to crypt depth; decreased jejunal transepithelial electrical resistance and a higher level of jejunal paracellular permeability of fluorescein isothiocyanate dextran 4 kDa; and downregulated protein levels of occludin and zonula occludens-1 (P < 0.05). Supplemental probiotics increased (P < 0.05) small intestinal Lactobacillus and Bifidobacterium, jejunal villus height, protein level of occludin, and decreased (P < 0.05) feed to gain ratio and small intestinal coliforms. These results indicate that dietary addition of probiotic mixture was effective in partially ameliorating intestinal barrier function. But no temperature x diet interaction was observed in the present study, revealing that the supplemented probiotics had the same effect at both temperatures.

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