Chitosan Oligosaccharide in Swine and Poultry Feed

Swine Evidence Highlights

10 peer-reviewed studies (2016–2025): Maternal, weaned pig, and challenge-specific outcomes

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Representative Study: Maternal COS & Piglet Intestinal Barrier

Maternal COS supplementation improves placental and intestinal barrier function in sows and piglets

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Key Findings

Maternal sow studies (COS ~100 mg/kg): Improved placental markers (GLUT1/3, VEGFA), reduced stillbirths/mummies, enhanced piglet intestinal barrier markers. Front Vet Sci 2024

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Dosing Context

Sows: ~100 mg/kg from late gestation through lactation

Weaned pigs: 50–100 mg/kg; benefits strongest for gut integrity

LC/LMWC: 50–100 mg/kg; challenge-specific effects

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Study Categories & Outcomes

Maternal/Gilt Studies

True COS 0.12–0.24 g/day improved milk yield, piglet weaning weight, immune markers

• Anim Nutr 2020

Weaned Pig (True COS)

100 mg/kg for 21 d: ↑ ADG, digestibility, villus height, sIgA; ↓ MDA

• RSC Adv 2017

Weaned Pig (LC/LMWC)

50–100 mg/kg; improved barrier/inflammation; attenuated ETEC-induced growth loss

Challenge-specific

Sow Reproductive

COS 100 mg/kg: ↓ stillbirths, improved placental oxidative markers

• Front Vet Sci 2024

Evidence strength: Moderate for maternal programs; Low for nursery LC/LMWC

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Poultry Evidence Highlights

11 peer-reviewed studies (2016–2025): Broiler challenge models and laying hen outcomes

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Study Categories & Key Findings

Broiler Challenge/Stress Models

Coccidia Challenge

~1 g/kg improved BWG, villus metrics, ileal digestibility; mitigated inflammation

• Br Poult Sci 2019

Dexamethasone Stress

1 g/kg mitigated growth/morphology declines; normalized cytokine/barrier genes

• Poult Sci 2020

Heat Stress

200–400 mg/kg improved growth maintenance, endocrine stress markers, meat quality

• Poult Sci 2020–2021

Early Life (d1-14)

200–800 mg/kg improved intestinal development without growth changes

• Poult Sci 2024

Laying Hen Studies

Fatty Liver Syndrome

400–800 mg/kg improved laying rate, egg quality; ↓ ovarian oxidative stress

• Animals 2022

Mandarah Production

0.1–0.5 g/kg improved egg production, FCR, fertility, hatchability

• Ann Anim Sci 2024

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Dosing Context

Broilers:

200–1000 mg/kg depending on stress/challenge model; 400 mg/kg frequently optimal for meat-quality/antioxidant endpoints

Layers:

0.1–0.5 g/kg for productivity/egg quality; 400–800 mg/kg in FLS models

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Representative Study Images

Heat-stress broiler endocrine response to COS supplementation

Layer fatty-liver syndrome: ovarian morphology improvements with COS

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Key Findings

• Stress mitigation: COS consistently improves oxidative status and gut development under challenge

• Meat quality: Enhanced under heat stress; 400 mg/kg optimal for antioxidant capacity

• Context-dependency: Benefits strongest in stress/challenge models

Evidence strength: Moderate for broiler stress mitigation; Moderate for layer productivity

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Evidence Strength, Risk of Bias, and Practical Takeaways

Risk assessment, supported claims, and dosing guidance for swine and poultry applications

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Evidence Strength & Risk Assessment

Maternal Sow Programs — Moderate

Broiler Stress Mitigation — Moderate

Nursery LC/LMWC — Low

Mechanistic Studies — Low

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Next Steps for Research

• Multi-site RCTs with standardized COS specifications

• Longer production-phase outcomes (≥42 days)

• Head-to-head comparisons with alternatives

• Mechanistic studies with causal pathways

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Practical Dosing Guidance

Sows

~100 mg/kg from late gestation through lactation

Evidence: Front Vet Sci 2024/2025

Weaned Pigs

50–100 mg/kg; strongest for gut integrity

Evidence: RSC Adv 2017

Broilers

200–1000 mg/kg depending on stress/challenge

Evidence: Poult Sci 2020-2021

Layers

0.1–0.5 g/kg for productivity/egg quality

Evidence: Ann Anim Sci 2024

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Supported: Context-specific benefits in maternal sow programs and broiler stress mitigation

Caution: Effects are dose-dependent and species-specific; not universal

Key: True COS ≠ LC/LMWC; chemistry matters for interpretation