Short Communications

Effects of Benzoic Acid on Intestinal Microflora and Metabolites of Piglets

  • GAO Zengbing ,
  • YU Bing ,
  • ZHENG Ping ,
  • HE Jun ,
  • MAO Xiangbing ,
  • YU Jie ,
  • DIAO Hui ,
  • YAN Honglin ,
  • WANG Quyuan ,
  • CHEN Daiwen
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  • Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education, Institute of Animal Nutrition, Sichuan Agricultural University, Ya'an 625014, China

Received date: 2013-11-08

  Online published: 2014-04-01

Abstract

This experiment was divided into in vivo experiment and in vitro experiment. In vivo experiment was conducted to study the effects of dietary benzoic acid on pH, microflora structure and metabolites in digestive tract digesta of piglets. In vitro experiment was designed to further investigate the direct effects of benzoic acid on Lactobacillus and Escherichia coli. 1) In vivo experiment, a total of 20 healthy ‘Duroc×Landrace×Yorkshire’ barrows with body weight of (18.75±0.20) kg were randomly divided into 2 groups with 10 replicates per group and 1 piglet per replicate, and fed a basal diet (control group) and the basal diet supplemented with 5 000 mg/kg benzoic acid (benzoic acid group), respectively. The experiment lasted for 14 d. 2) Based on the benzoic acid concentration and pH in intestinal digesta that were determined in vivo, in vitro experiment was conducted to further investigate the effects of different benzoic acid concentrations (0, 5, 15, 30, 200 and 1 000 mg/L) and pH (5.0, 5.5, 6.0, 6.5 and 7.0) on porcine Lactobacillus johnsonii JJB3 and Escherichia coli ATCC25922. The results showed as follows: 1) compared with control group, the supplementation of 5 000 mg/kg benzoic acid significantly increased benzoic acid concentration in duodenal and ileal digesta (P<0.05), and decreased the pH in stomach, ileal, colonic (P<0.05) and rectal (P<0.01) digesta; 5000 mg/kg benzoic acid increased the number of Lactobacillus in ileal (P<0.05) and cecal (P<0.10) digesta, and increased the number of Bifidobacterium in ileal and cecal digesta (P<0.10). The concentrations of propionic acid, butyric acid and total volatile fatty acid in caecal digesta were increased in 5 000 mg/kg benzoic acid group (P<0.10). 2) The OD600 value of Lactobacillus johnsonii JJB3 was increased with the increase of pH, and Lactobacillus had a strong tolerance to the concentration of benzoic acid. Benzoic acid at the concentration of 5, 15, 30 and 200 mg/L had beneficial ability, and 30 and 200 mg/L were better. The different concentrations of benzoic acid had antibacterial ability on Escherichia coli ATCC25922, and the high concentration of benzoic acid had more obvious antibacterial ability at pH 5.0 and 5.5. In conclusion, the diets supplemented with 5 000 mg/kg benzoic acid reduce the digestive tract pH of piglets, promote the growth of beneficial bacteria, improve the intestinal microflora structure, and increase the concentrations of propionic acid, butyric acid and total volatile fatty acid.

Cite this article

GAO Zengbing , YU Bing , ZHENG Ping , HE Jun , MAO Xiangbing , YU Jie , DIAO Hui , YAN Honglin , WANG Quyuan , CHEN Daiwen . Effects of Benzoic Acid on Intestinal Microflora and Metabolites of Piglets[J]. Chinese Journal of Animal Nutrition, 2014 , 26(4) : 1044 -1054 . DOI: 10.3969/j.issn.1006-267x.2014.04.025

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