Effects of Dietary Fiber on Growth Performance, Relative Weight of Organs and mRNA Expression of Inflammatory Cytokines in Lipopolysaccharide-Challenged Piglets

  • SUN Xiao ,
  • LI Zidan ,
  • LIU Hua ,
  • GUO Zhiguo ,
  • LI Defeng ,
  • ZHU Xiaoyan ,
  • LI Zhentian ,
  • WANG Chengzhang ,
  • CUI Yalei ,
  • SHI Yinghua
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  • 1. College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou 450002, China;
    2. Henan Key Laboratory of Innovation and Utilization of Grassland Resources, Zhengzhou 450002, China;
    3. Henan Engineering Research Center for Forage, Zhengzhou 450002, China

Received date: 2019-05-06

  Online published: 2019-11-19

Abstract

The purpose of this study was to investigate the effects of dietary fiber on growth performance, relative weight of organs and mRNA expression of inflammatory cytokines in lipopolysaccharide (LPS)-challenged piglets. The experiment was designed as 2×2 double-factor trial design and the two factors were dietary fiber (basal diet or basal diet supplemented with 2% fiber) and LPS challenge (injection of LPS or physiological saline). Ninety-six healthy 34-day-old Duroc×Landrace×Large White piglets[average body weight was (7.93±0.03) kg] were selected and the selected piglets were randomly divided into 4 treatments according to the principle of similar body weight with 3 replicates in each treatment and 8 piglets per replicate. Piglets in treatments 1 and 3 were fed a basal diet, while piglets in treatments 2 and 4 were fed the basal diet supplemented with 2% fiber. The experimental period was 28 days. On the 16th and 28th day of the experiment, the piglets in treatments 3 and 4 were intraperitoneally injected with 100 μg/kg BW of LPS, and the piglets in treatments 1 and 2 were intraperitoneally injected with the same amount of physiological saline. On the 28th day, piglets were slaughtered at 12 h after injection of LPS or physiological saline. And, samples of heart, liver, spleen, lung, kidney and thymus were obtained for determination. The mRNA expression levels of inflammatory cytokines including interleukin-1β (IL-1β), interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) in heart, liver, spleen and thymus were measured by real-time quantitative PCR (RT-qPCR). The results demonstrated as follows:1) LPS challenge significantly reduced the average daily feed intake and average daily gain of piglets during whole experiment period (P<0.05), while the addition of fiber to the diet had a tendency to increase the average daily gain of piglets (P=0.076). LPS challenge significantly increased the feed/gain of piglets during days 16 to 22 (P<0.05), while the addition of fiber to the diet significantly decreased the feed/gain of piglets during whole experiment period (P<0.05). 2) The addition of fiber to the diet significantly increased the relative weight of thymus of piglets (P<0.05), tended to increase the relative weight of heart (P=0.054). The relative weights of liver, spleen and lung increased, but the differences were not significant (P>0.05). 3) The mRNA of inflammatory cytokines expressed in heart, thymus, liver and spleen. The expression level of IL-1β mRNA was highest in the thymus of piglets, which was significantly higher than that in heart, liver and spleen (P<0.05). The expression levels of IL-6 and TNF-α mRNA in the spleen of piglets were the highest, which were significantly higher than those in heart, liver and thymus (P<0.05). 4) LPS challenge increased the expression levels of IL-1β and TNF-α mRNA in liver of piglets(P>0.05), and increased the expression level of IL-6 mRNA in thymus (P>0.05), while the addition of fiber to the diet decreased the expression level of TNF-α mRNA in spleen (P>0.05) and significantly decreased the expression levels of IL-1β, IL-6 and TNF-α mRNA in thymus (P<0.05). Comprehensively, the results indicate that LPS challenge decrease the growth performance of piglets, while the addition of fiber to the diet can increase the relative weight of immune organs of piglets, reduce the mRNA expression levels of inflammatory cytokines in the thymus, alleviate the inflammatory response caused by LPS challenge, improve the growth performance of piglets and reduce the negative effects of immune stress on piglets.

Cite this article

SUN Xiao , LI Zidan , LIU Hua , GUO Zhiguo , LI Defeng , ZHU Xiaoyan , LI Zhentian , WANG Chengzhang , CUI Yalei , SHI Yinghua . Effects of Dietary Fiber on Growth Performance, Relative Weight of Organs and mRNA Expression of Inflammatory Cytokines in Lipopolysaccharide-Challenged Piglets[J]. Chinese Journal of Animal Nutrition, 2019 , 31(11) : 5018 -5028 . DOI: 10.3969/j.issn.1006-267x.2019.11.016

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