畜牧兽医学报 ›› 2024, Vol. 55 ›› Issue (5): 2241-2252.doi: 10.11843/j.issn.0366-6964.2024.05.041

• 临床兽医 • 上一篇    下一篇

黄芪多糖、皂苷及益生菌复合物对感染大肠杆菌肉鸡肠道的保护作用

刘佳惠, 吴开开, 王磊, 张康, 韩松伟, 陈富斌, 徐国伟, 郭志廷, 古雪艳, 张景艳*, 李建喜*   

  1. 中国农业科学院兰州畜牧与兽药研究所, 兰州 730050
  • 收稿日期:2023-06-28 出版日期:2024-05-23 发布日期:2024-05-27
  • 通讯作者: 张景艳,主要从事中兽医及免疫研究,E-mail:zwzh1223@126.com;李建喜,主要从事兽医临床诊断学/中兽医免疫,E-mail:lzjianxil@163.com
  • 作者简介:刘佳惠(1998-),女,河南尉氏人,硕士生,主要从事兽医学研究,E-mail:13608696346@163.com;吴开开(1994-),男,山西稷山人,硕士生,主要从事兽医学研究,E-mail:2719807875@qq.com。刘佳惠和吴开开为同等贡献作者
  • 基金资助:
    益生菌发酵黄芪工艺研究及制剂开发(2022YFD1801104);中兽医与临床科技创新工程(CAAS-ASTIP-2015-LIHPS)

Protective Effects of Astragalus Polysaccharides, Saponins and Probiotic Compounds on Intestinal Tract of Broilers Infected with E.coli

LIU Jiahui, WU Kaikai, WANG Lei, ZHANG Kang, HAN Songwei, CHEN Fubin, XU Guowei, GUO Zhiting, GU Xueyan, ZHANG Jingyan*, LI Jianxi*   

  1. Lanzhou Institute of Animal Husbandry and Veterinary Medicine, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China
  • Received:2023-06-28 Online:2024-05-23 Published:2024-05-27

摘要: 旨在评价黄芪多糖(APS)、皂苷(AS)与益生菌的复合物对肉鸡抗大肠杆菌感染能力的影响。选取1日龄的白羽肉鸡200只,随机分为空白组、受试物组、阳性组和模型组,每组50只鸡,试验期42 d。1~21 d,空白组和模型组雏鸡每日饲喂基础日粮并灌服生理盐水0.2 mL·只-1,受试物组饲喂含APS(1 g·kg-1)与AS(10 mg·kg-1)的试验日粮,并灌服益生菌复合菌液0.2 mL·只-1(非解乳糖链球菌∶植物乳杆菌∶枯草芽孢杆菌=1∶1∶1,菌液浓度均为1×109 CFU·mL-1),阳性组雏鸡每天饲喂基础日粮中添加了50 mg·kg-1盐酸多西环素可溶性粉的试验日粮。21 d时,受试物组、阳性组和模型组试验鸡均灌服0.2 mL·只-1大肠杆菌O78菌液(6×108 CFU·mL-1)。在感染第0、1、7、14和21天(即试验期第21、22、28、35和42天)检测十二指肠和空肠组织结构、sIgA、炎性因子和氧化指标,同时检测盲肠内容物细菌数量。结果显示:1)除感染第0天外,模型组盲肠大肠杆菌数量均显著高于空白组、受试物组和阳性组(P<0.05),感染后第0、1、7、14和21天,受试物组鸡乳酸菌数量显著高于空白组、阳性组和模型组(P<0.05)。2)感染1和7 d时,受试物组和阳性组鸡十二指肠和空肠组织sIgA含量显著高于空白组和模型组(P<0.05);感染14 d时,受试物组鸡空肠组织sIgA含量显著高于空白组和模型组(P<0.05)。3)感染1和7 d时,受试物组和阳性组十二指肠、空肠的TNF-α含量显著低于模型组(P<0.05);感染7 d时,受试物组和阳性组十二指肠和空肠IL-10含量显著高于模型组(P<0.05);感染14和21 d时,受试物组和阳性组空肠组织IL-10含量显著高于模型组(P<0.05)。4)感染1、7、14、21 d时,受试物组、阳性组的十二指肠、空肠组织MPO活力显著高于空白组(P<0.05);感染1 d时,受试物组和阳性组空肠组织SOD显著高于模型组(P<0.05);感染7、21 d时,受试物组和阳性组十二指肠和空肠组织T-AOC显著高于模型组(P<0.05)。综上,在本试验条件下,APS、AS与益生菌复合物联合使用能增强雏鸡抗大肠杆菌感染能力,有替代抗生素的作用。

关键词: 黄芪多糖, 黄芪皂苷, 益生菌, 肉鸡肠道, 保护作用

Abstract: The aim of this study was to evaluate the effects of Astragalus polysaccharide (APS), saponins (AS) and probiotics on the resistance to E. coli infection in broilers. A total of 200 1-day-old white-feathered broiler chickens were randomly divided into blank group, test group, positive group and model group, with 50 chickens in each group. The experiment lasted for 42 d. From 1 to 21 days, chicks in the blank group and model group were fed a basic diet and each of them was given 0.2 mL of normal saline every day, while chicks in the test group were fed a basic diet containing APS (1 g·kg-1) and AS (10 mg·kg-1), and each of them was given 0.2 mL of probiotic complex bacterial solution (Streptococcus alactolyticus∶Lactobacillus plantae∶Bacillus subtilis=1∶1∶1, the concentration of bacterial liquid was 1×109 CFU·mL-1), and chicks in the positive group were fed a basal diet containing 50 mg·kg-1 doxycycline hydrochloride soluble powder every day. At the 21st day, chickens in test group, positive group and model group each were given 0.2 mL Escherichia coli O78 bacterial solution (6×108 CFU·mL-1). Duodenum and jejunum tissue structure, sIgA, inflammatory factors, and oxidation markers were detected at days 0, 1, 7, 14, and 21 of infection (i.e., days 21, 22, 28, 35, and 42 of the trial period), as well as bacterial count in cecum contents. The results were showed as follows: 1) The number of E. coli in model group (except for the 0 day of infection) was significantly higher than that in blank group, test group and positive group (P<0.05), and the number of chicken lactic acid bacteria in test group was significantly higher than that in blank group, positive group and model group (P<0.05). 2) After 1 and 7 days of infection, the sIgA content in duodenum and jejunum tissues of test group and positive group was significantly higher than that of blank group and model group (P<0.05); After 14 days of infection, the sIgA content of jejunum tissue in test group was significantly higher than that in blank group and model group (P<0.05). 3) When infected for 1 and 7 d, the TNF-α content of duodenum and jejunum in the test group and the positive group was significantly lower than that in the model group (P<0.05); When infected for 7 days, the content of duodenum and jejunum IL-10 in the test group and the positive group was significantly higher than that in the model group (P<0.05); After 14 and 21 days of infection, the content of IL-10 in jejunal tissue in the test group and the positive group was significantly higher than that in the model group (P<0.05). 4) When infected for 1, 7, 14 and 21 days, the MPO activity of duodenal and jejunal tissues in the test group and the positive group was significantly higher than that in the blank group (P<0.05).When infected for 1 d, the SOD of jejunal tissues in the test group and the positive group was significantly higher than that in the model group (P<0.05), and when infected after 7 and 21 days, the T-AOC of duodenal and jejunal tissues in the test group and the positive group was significantly higher than that in the model group (P<0.05). In conclusion, under the condition of the current experiment, the combination of APS, AS and probiotic complex can enhance the ability of chicks to resist E. coli infection, and have the effect of replacing antibiotics.

Key words: Astragalus polysaccharides, Astragalus saponins, probiotics, broiler intestines, protective effect

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