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. 2019 Jun;32(6):856-864.
doi: 10.5713/ajas.18.0517. Epub 2018 Oct 29.

Mixed organic acids improve nutrients digestibility, volatile fatty acids composition and intestinal microbiota in growing-finishing pigs fed high-fiber diet

Miao Li  1 , Shenfei Long  1 , Qianqian Wang  1 , Lianhua Zhang  1 , Jiangxu Hu  1 , Jie Yang  2 , Zhibin Cheng  3 , Xiangshu Piao  1
Affiliations

Mixed organic acids improve nutrients digestibility, volatile fatty acids composition and intestinal microbiota in growing-finishing pigs fed high-fiber diet

Miao Li et al. Asian-Australas J Anim Sci. 2019 Jun.

Abstract

Objective: The objective of this study was to investigate effects of mixed organic acids (MOA) on nutrient digestibility, volatile fatty acids composition and intestinal microbiota in growing-finishing pigs fed high wheat bran diet.

Methods: Six crossbred barrows (Duroc×Landrace×Yorkshire), with an average body weight 78.8±4.21 kg, fitted with T-cannulas at the distal ileum, were allotted to a double 3×3 Latin square design with 3 periods and 3 diets. Each period consisted of a 5-d adjustment period followed by a 2-d total collection of feces and then a 2-d collection of ileal digesta. The dietary treatments included a corn-soybean-wheat bran basal diet (CTR), mixed organic acid 1 diet (MOA1; CTR+3,000 mg/kg OA1), mixed organic acid 2 diet (MOA2; CTR+2,000 mg/kg OA2).

Results: Pigs fed MOA (MOA1 or MOA2) showed improved (p<0.05) apparent total tract digestibility (ATTD) of gross energy, dry matter and organic matter, and pigs fed MOA2 had increased (p<0.05) ATTD of neutral detergent fiber compared to CTR. Dietary MOA supplementation decreased (p<0.05) pH value, and improved (p<0.01) concentrations of lactic acid and total volatile fatty acids (TVFA) in ileum compared to CTR. Pigs fed MOA showed higher (p<0.05) concentration of acetic acid, and lower (p<0.05) content of formic acid in feces compared to CTR. Pigs fed MOA1 had increased (p<0.05) concentration of TVFA and butyric acid in feces. Pigs fed MOA1 showed higher concentration of Lactobacillus and lower concentration of Escherichia in feces compared to CTR.

Conclusion: Dietary supplementation of MOA 1 or 2 could improve nutrients digestibility, TVFA concentration and intestinal flora in growing-finishing pigs fed high fiber diet.

Keywords: Growing-finishing Pigs; Microbiota; Nutrients Digestibility; Organic Acids; Volatile Fatty Acids; Wheat Bran.

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Conflict of interest statement

CONFLICT OF INTEREST

We certify that there is no conflict of interest with any financial organization regarding the material discussed in the manuscript. Yang J is an employee of Yunnan Kuaidaduo Animal Husbandry Technology Co., LTD.

Figures

Figure 1
Figure 1
Genus-level distribution of bacteria in the feces of growing-finishing pigs fed basal diet (CTR), basal diet with 3,000 g/kg mixed organic acid 1 (MOA1), or basal diet with 2,000 g/kg mixed organic acid 2 (MOA2).
Figure 2
Figure 2
Phylum-level distribution of bacteria in the feces of growing-finishing pigs fed basal diet (CTR), basal diet with 3,000 g/kg mixed organic acid 1 (MOA1), or basal diet with 2,000 g/kg mixed organic acid 2 (MOA2).
Figure 3
Figure 3
Principal coordinates analysis (PCoA) of the bacterial diversity based on the weighted UniFrac distances between the microbiome profiles of pigs fed basal diet (CTR), basal diet with 3,000 g/kg mixed organic acid 1 (MOA1), or basal diet with 2,000 g/kg mixed organic acid 2 (MOA2). n = 3 per treatment; blue for CTR, red for MOA1, green for MOA2.
See this image and copyright information in PMC

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