External supporting research SCFAs, gut barrier & inflammation Peer reviewed EXT-S03

Butyrate, Gut Barrier & Inflammation in Livestock — 2025 Review

A peer-reviewed cross-species review examining evidence that butyrate supports intestinal barrier integrity, microbial balance, immune regulation and inflammatory control across cattle, pigs, sheep and goats.

Original study title

Butyrate Supplementation Improves Intestinal Health and Growth Performance in Livestock: A Review

Butyrate Short-chain fatty acids Gut barrier Inflammation Microbiome Immune regulation Cross-species evidence

Study at a glance

Year 2025

Study type Narrative review

Publication Peer-reviewed review article

EquiNectar tested? No

Peer reviewed Yes

Open access Yes

Relationship External supporting research

Research question

What did the researchers want to understand?

What does the existing livestock research show about the effects of butyrate on intestinal barrier integrity, gut microbial ecology, inflammation, immune regulation and animal performance, and through which biological mechanisms might these effects occur?

Researchers

Study authors

Wenting Chen

Liaocheng University

Qingshan Ma

Liaocheng University

Yan Li

Liaocheng University

Lin Wei

Liaocheng University

Zhenwei Zhang

Liaocheng University

Adnan Khan

University College Dublin

Muhammad Zahoor Khan

Liaocheng University

Changfa Wang

Liaocheng University

Research organizations

Research institutions

Liaocheng University

University
China

University College Dublin

University
Ireland

Methodology

How the study was conducted

Study design

This was a peer-reviewed narrative review of existing scientific literature.

The authors synthesized research examining butyrate biology and supplementation across livestock species, with particular emphasis on calves, pigs, sheep and goats.

The review considered intestinal development, microbial composition, growth and feed efficiency, inflammatory and immune pathways, antioxidant activity and epigenetic regulation.

Only English-language articles published in peer-reviewed journals indexed in the Science Citation Index were included. Most were published from 2017 onward, supplemented by five relevant studies published between 2011 and 2016.

The review was designed to identify recurring biological mechanisms and practical opportunities for butyrate supplementation rather than to calculate a pooled treatment effect.

What was measured

No new animals, biological samples or experimental outcomes were measured in this paper.

The authors reviewed peer-reviewed literature examining the effects of butyrate and butyrate supplementation on intestinal health, microbial ecology, growth performance, immune function, inflammation, antioxidant activity and cellular signaling in livestock.

The literature search primarily covered publications from 2017 onward, together with five earlier papers published between 2011 and 2016.

Search terms included butyrate, intestinal health, growth, inflammation, immunity, intestinal microbiota, sodium butyrate, tributyrin and livestock species including cattle, pigs, sheep and goats.

Books, book chapters, conference papers and unpublished materials were excluded.

Study findings

Key results

• Across cattle, pigs, sheep and goats, butyrate supplementation has been associated with changes in intestinal development, microbial composition, immune function and inflammatory signaling.

• Butyrate acts both as a microbial energy metabolite and as a signaling molecule capable of affecting host cellular pathways.

• Studies reviewed report support for epithelial barrier integrity and intestinal development.

• Butyrate has been associated with reduced inflammatory signaling and modulation of immune responses in several experimental models.

• Butyrate can influence gene expression through epigenetic mechanisms including histone acetylation.

• Changes in microbial diversity and microbial populations have been reported following butyrate supplementation across several livestock species.

• Effects vary according to species, dose, butyrate formulation, diet and developmental stage.

• The authors conclude that further work is required to optimize species-specific supplementation strategies and understand long-term effects.

Interpretation

What do the findings mean?

Across multiple livestock species, the reviewed evidence identifies butyrate as more than a fermentation end-product.

Butyrate acts as an energy source for intestinal epithelial cells, participates in regulation of epithelial growth and differentiation, influences microbial community structure and can modulate inflammatory and immune signaling.

Several biological mechanisms recur across the literature, including effects on inflammatory pathways, epithelial barrier function and epigenetic regulation of gene expression.

These observations strengthen the broader biological case that microbial metabolites can act as signaling molecules connecting diet, microbial fermentation and host physiology.

However, the magnitude and direction of effects depend on species, developmental stage, gastrointestinal location, dosage and the form in which butyrate is supplied. This prevents simple translation from livestock supplementation studies to horses or to interventions that alter endogenous short-chain fatty acid production.

In practice

Why this research matters

Butyrate is a naturally occurring short-chain fatty acid produced by microbial fermentation and acts both as an energy source and as a biologically active signaling molecule.

Across the livestock research reviewed, recurring effects of butyrate included support for intestinal epithelial development, gut barrier integrity, microbial balance, immune regulation and inflammatory control.

The review also describes mechanisms through which butyrate may influence cellular activity and gene expression, including modulation of inflammatory signaling and histone deacetylase activity.

For horse owners, the value of this research is not that results from cattle, pigs, sheep or goats can simply be transferred to horses. Rather, it demonstrates that microbial fermentation products such as butyrate are biologically active molecules capable of influencing the host well beyond their contribution to dietary energy.

Research transparency

Study limitations

This is a review article and generated no new experimental data.

The evidence summarized comes from several livestock species, principally cattle, pigs, sheep and goats. Horses were not included, and important differences in gastrointestinal anatomy, fermentation site, metabolism and feeding behavior mean that findings cannot automatically be extrapolated to horses.

The interventions reviewed were heterogeneous and included different forms of butyrate, dosages, treatment durations and animal life stages.

Many mechanistic findings originated from experimental models rather than naturally occurring gastrointestinal disease.

The review focuses primarily on direct butyrate supplementation. This is biologically different from changing the amount of butyrate produced endogenously by the existing intestinal microbiota.

Although the authors applied defined literature-search criteria and limited inclusion to English-language peer-reviewed studies indexed in the Science Citation Index, this was not a formal systematic review or meta-analysis.

The findings therefore provide valuable cross-species mechanistic context but should not be interpreted as direct evidence for an equine nutritional intervention.

EquiNectar context

How this research relates to EquiNectar

This research did not test EquiNectar and did not involve horses.

Its relevance to EquiNectar is cross-species and mechanistic. The review brings together evidence from cattle, pigs, sheep and goats showing that butyrate has biological functions extending beyond its role as an energy substrate. These include effects on intestinal epithelial integrity, tight-junction proteins, microbial ecology, immune signaling and inflammatory pathways.

Published EquiNectar research has separately measured increases in fecal short-chain fatty acids, including butyrate, during supplementation in horses. This review therefore provides broader biological context for understanding why changes in microbial butyrate production may be scientifically interesting.

Most studies reviewed here administered butyrate or butyrate-containing compounds directly. Increasing endogenous microbial butyrate production is not necessarily equivalent to supplementing butyrate directly, and findings from cattle, pigs, sheep or goats cannot be assumed to occur in horses.

The paper therefore supports the biological relevance of butyrate, not the efficacy of EquiNectar.

Tharos / EquiNectar involvement

None. This review was conducted independently of Tharos Ltd and EquiNectar. The paper does not evaluate EquiNectar or horses.

EquiNectar evaluated No

Transparency

Funding & competing interests

Funding statement

The research was supported by multiple Chinese national, provincial and institutional research programs, including the National Key R&D Program of China, the Shandong Province Modern Agricultural Technology System, the Ministry of Agriculture and Rural Affairs, the National Natural Science Foundation of China, Liaocheng University and associated agricultural research programs.

Competing interests

The authors declared no financial, personal, professional or other interests that could inappropriately influence the content of the review.

Source record

Publication details

Journal

Biomolecules

Publisher

MDPI

Year

2025

Volume

Issue

Pages / article

DOI

10.3390/biom15010085

PMID

39858479

Species

Livestock — cattle, pigs, sheep and goats

License

CC BY 4.0

View original source ↗ Read full text ↗

Recommended citation

Chen W, Ma Q, Li Y, Wei L, Zhang Z, Khan A, Khan MZ, Wang C. Butyrate Supplementation Improves Intestinal Health and Growth Performance in Livestock: A Review. Biomolecules. 2025;15(1):85. doi:10.3390/biom15010085.

Butyrate, Gut Barrier & Inflammation in Livestock — 2025 Review

What did the researchers want to understand?

Study authors

Wenting Chen

Qingshan Ma

Yan Li

Lin Wei

Zhenwei Zhang

Adnan Khan

Muhammad Zahoor Khan

Changfa Wang

Research institutions

Liaocheng University

University College Dublin

How the study was conducted

Key results

What do the findings mean?

Why this research matters

Study limitations

How this research relates to EquiNectar

Funding & competing interests

Funding statement

Competing interests

Publication details

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