Effects of dietary addition of heat-killed Mycobacterium phlei on growth performance, immune status and anti-oxidative capacity in early weaned piglets

文献类型： 外文期刊

第一作者： Zhong, Jin-Feng

作者： Zhong, Jin-Feng;Tu, Wei;Fang, Re-Jun;Zhong, Jin-Feng;Tu, Wei;Fang, Re-Jun;Zhong, Jin-Feng;Wu, Wei-Gao;Liu, Zhen-Xiang;Zhang, Xiao-Qing

作者机构：

关键词： Antibiotics;diarrhoea;early weaning;immune system;Mycobacterium phlei;performance;piglets

期刊名称：ARCHIVES OF ANIMAL NUTRITION （ 影响因子：2.242； 五年影响因子：2.601 ）

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收录情况： SCI

摘要： The contradiction between high susceptibility of early weaned piglets to enteric pathogens and rigid restriction of antibiotic use in the diet is still prominent in the livestock production industry. To address this issue, the study was designed to replace dietary antibiotics partly or completely by an immunostimulant, namely heat-killed Mycobacterium phlei (M. phlei). Piglets (n=192) were randomly assigned to one of the four groups: (1) basal diet (Group A), (2) basal diet+a mixture of antibiotics (80mg/kg diet, Group B), (3) basal diet+a mixture of antibiotics (same as in Group B, but 40mg/kg diet) + heat-killed M. phlei (1.5g/kg diet) (Group C) and (4) basal diet + heat-killed M. phlei (3g/kg diet) (Group D). All piglets received the respective diets from days 21 to 51 of age and were weaned at the age of 28 d. Compared with the Control (Group A), in all other groups the average daily gain, average daily feed intake, small intestinal villus height:crypt depth ratio and protein levels of occludin and ZO-1 in the jejunal mucosa were increased. A decreased incidence of diarrhoea in conjunction with an increased sIgA concentration in the intestinal mucosa and serum IL-12 and IFN- concentrations was found in groups supplemented with heat-killed M. phlei (Groups C and D), but not in Group B. Groups C and D also showed decreased IL-2 concentrations in the intestinal mucosa with lower TLR4 and phosphor-IB protein levels. The antioxidant capacity was reinforced in Groups C and D, as evidenced by the reduction in malondialdehyde and enhanced activities of antioxidant enzymes in serum. These data indicate that heat-killed M. phlei is a promising alternative to antibiotic use for early weaned piglets via induction of protective immune responses.

分类号： S8

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