21 Peer-Reviewed Feeding Trials
21
Studies Included
2016-2025
Publication Period
10
Swine Studies
11
Poultry Studies
Inclusion & Exclusion Criteria
Inclusion: 2016-present, peer-reviewed primary animal feeding trials, swine or poultry, dietary COS (true COS) or LC/LMWC flagged as chemistry caveat, outcomes in performance, gut health, immunity, oxidative status
Exclusion: Pre-2016, reviews/meta-analyses, theses/preprints, vaccine-only/non-feed routes, in vitro-only, non-swine/poultry
Chemistry Note: True COS ≠ LC/LMWC. Results stratified; LC/LMWC interpreted cautiously
Study Flow
21
Studies Included
↓
10
Swine Studies
↓
11
Poultry Studies
Key Findings Overview
Gut Health
Consistent improvements in intestinal barrier function and morphology
Oxidative Status
Enhanced antioxidant capacity across multiple species
Immune Function
Modulated inflammatory markers and immune responses
Production
Context-dependent growth performance improvements
Evidence Strength
- Moderate: Maternal sow programs, broiler stress mitigation
- Low: Nursery LC/LMWC, associative microbiota links
Swine Evidence Highlights
10 peer-reviewed studies (2016–2025): Maternal, weaned pig, and challenge-specific outcomes
Representative Study: Maternal COS & Piglet Intestinal Barrier
Maternal COS supplementation improves placental and intestinal barrier function in sows and piglets
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
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
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
Poultry Evidence Highlights
11 peer-reviewed studies (2016–2025): Broiler challenge models and laying hen outcomes
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
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
Representative Study Images
Heat-stress broiler endocrine response to COS supplementation
Layer fatty-liver syndrome: ovarian morphology improvements with COS
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
Evidence Strength, Risk of Bias, and Practical Takeaways
Risk assessment, supported claims, and dosing guidance for swine and poultry applications
Evidence Strength & Risk Assessment
Maternal Sow Programs — Moderate
Broiler Stress Mitigation — Moderate
Nursery LC/LMWC — Low
Mechanistic Studies — Low
| Claim Type | Status | Evidence |
|---|---|---|
| Gut barrier & morphology | ✓ Supported | Consistent across species |
| Antioxidant status | ✓ Supported | Multiple studies confirm |
| Universal growth promotion | ✗ Not supported | Context-dependent |
| Antibiotic replacement | ✗ Not supported | Insufficient evidence |
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
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
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