Fermented distiller’s grains improve broiler immunity and antioxidant capacity by modulating cecal microbiota and cecal/plasma metabolomes.
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Fermented Distiller’s Grains Boost Broiler Chicken Immunity and Gut Health

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A breakthrough study published in BMC Microbiology (2025) by researchers from Guizhou University reveals that fermented distiller’s grains (FDG)—a byproduct of alcohol production—can significantly enhance the immune and antioxidant systems of broiler chickens without compromising growth performance.

Study Overview:
The team led by Dr. Chao Chen conducted a controlled feeding experiment using 216 yellow-feathered broilers. Birds were divided into three groups: a control (0% FDG), 5% FDG, and 10% FDG feed replacement. The researchers measured serum biochemical markers, antioxidant activity, cecal microbiota, and plasma metabolites to assess the physiological and metabolic impacts.

Key Findings:

  • Improved Immunity: Broilers fed FDG showed elevated levels of immunoglobulins (IgA, IgG) and insulin-like growth factor (IGF-1), suggesting enhanced disease resistance and growth potential.
  • Enhanced Antioxidant Defense: The 5% and 10% FDG groups had higher activity of antioxidant enzymes (SOD, GSH-Px, CAT) and lower malondialdehyde (MDA) levels, indicating reduced oxidative stress.
  • Gut Microbiota Modulation: 16S rDNA sequencing revealed beneficial shifts in gut bacteria, including increases in Oscillospira, Odoribacter, and UCG-010, and reductions in pathogens like Helicobacter and Campylobacterota.
  • Metabolic Insights: Metabolomics analyses showed FDG altered lipid and amino acid metabolism, particularly enhancing tyrosine metabolism and signal transduction pathways linked to growth and immunity.

Implications:
This study provides a scientific basis for using FDG as a sustainable feed ingredient, potentially reducing reliance on costly soybean meal while improving poultry health and productivity. Researchers note that moderate inclusion (around 5%) yields optimal results without adverse effects.

Conclusion:
The findings underscore FDG’s potential as an eco-friendly, nutrient-rich alternative feed additive for modern poultry farming—aligning with global efforts to enhance food sustainability and circular bioeconomy practices.

Reference

Mei, S., He, G., Chen, Z. et al. Fermented distiller’s grains improve broiler immunity and antioxidant capacity by modulating cecal microbiota and cecal/plasma metabolomes. BMC Microbiol 25, 678 (2025). https://doi.org/10.1186/s12866-025-04397-3

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