Study tests phytogenic anticoccidial strategy in broiler coccidiosis
Bottom line
Coccidiosis research is moving a little further toward phytogenic options, with a new Veterinary Sciences study evaluating solid-dispersion formulations made from Curcuma longa and Piper longum extracts in broiler chickens challenged with Eimeria tenella. In the experimental trial, Thai researchers tested seven groups of Cobb 500 broilers, including infected untreated controls, an amprolium-treated positive control, and several extract formulations. The strongest phytogenic result came from the Piper longum-only T3 group at 6 g/kg feed, which produced cecal lesion scores comparable to the amprolium group and reduced oocyst shedding versus infected untreated birds. The infected control group shed 5.74 × 10⁶ oocysts/g, compared with 1.39 × 10⁶ in T3 and 1.01 × 10⁶ in the amprolium group. T3 birds also posted the best growth performance among the treatment groups. (preprints.org)
Why it matters: For veterinary professionals working with poultry systems, the study adds to a growing body of evidence that phytogenic compounds may help support coccidiosis control, especially as the industry continues to manage anticoccidial resistance, residue concerns, and pressure to reduce conventional drug use. Still, this was a small experimental study with 74 birds total, a field-strain E. tenella challenge, and some limitations around performance data analysis, so it doesn't support a practice change on its own. It does, however, reinforce broader research showing curcumin- and plant-based strategies can reduce gut damage and oocyst shedding under challenge conditions. (preprints.org)
What to watch: The next step is whether these formulations can be replicated in larger, commercially relevant field trials, and whether any developer advances them toward a marketable feed additive or adjunct coccidiosis-control program. (preprints.org)
Key facts
- Study type
- Experimental poultry study
- Journal
- Veterinary Sciences
- Species
- Cobb 500 broiler chickens
- Sample size
- 74 birds
- Challenge organism
- Eimeria tenella
- Best phytogenic treatment
- Piper longum extract, T3
- Dose
- 6 g/kg feed
- Key finding
- T3 lesion scores were comparable to amprolium and reduced oocyst shedding versus infected untreated birds
- Oocyst shedding
- 5.74 × 10^6 oocysts/g in infected controls, 1.39 × 10^6 in T3, and 1.01 × 10^6 in amprolium
A new poultry study suggests formulation may matter as much as the plant compound itself when it comes to coccidiosis control. Researchers reporting in Veterinary Sciences tested solid-dispersion formulations containing Curcuma longa and Piper longum extracts against Eimeria tenella infection in broiler chickens, aiming to improve the bioavailability of phytogenic compounds that have shown promise but often suffer from poor solubility and inconsistent performance. (preprints.org)
That focus reflects a familiar pressure point in poultry health. Coccidiosis remains one of the industry's most costly endemic diseases, and the longer-term reliance on anticoccidials has driven persistent concerns about resistance, residues, and environmental burden. Recent literature and industry-oriented research continue to frame phytogenics and other non-antibiotic approaches as possible support tools, not simple replacements, within broader control programs. One recent poultry health paper cited a 2016 global cost estimate of roughly £10.4 billion to the broiler industry, while reviews published in 2025 and 2026 again highlighted resistance pressure and the need for residue-free alternatives. (sciencedirect.com)
In the new study, the investigators used 74 one-day-old Cobb 500 broilers divided into seven groups: an uninfected negative control, an infected untreated control, an infected amprolium-treated positive control, and four phytogenic treatment arms. Birds in infected groups were challenged at 25 days of age with 1 × 10⁶ sporulated E. tenella oocysts from a field strain obtained from Chulalongkorn University. The authors prepared the plant extracts as solid dispersions with PVP K30 using a hot-melt process intended to improve dissolution and stability. (preprints.org)
Results were mixed, but one treatment stood out. The T3 group, which received Piper longum extract at 6 g/kg feed, showed lesion scores of 0.68 ± 0.42, essentially matching the amprolium group's 0.73 ± 0.11 and improving on the infected untreated control's 2.45 ± 0.53. Oocyst shedding followed the same pattern: 5.74 × 10⁶ oocysts/g in infected untreated birds, 1.01 × 10⁶ in the amprolium group, and 1.39 × 10⁶ in T3. T3 also had the best final weight, body weight gain, and average daily gain among the phytogenic groups, while higher-dose or combination arms did not consistently outperform it. The authors suggested that piperine's bioenhancing effects may have contributed, though that remains an interpretation rather than a proven mechanism in this trial. (preprints.org)
The findings fit with earlier work, but they don't arrive in a vacuum. USDA Agricultural Research Service research previously found that dietary Curcuma longa reduced parasite multiplication, gut damage, and fecal oocyst shedding while improving weight gain in experimentally infected broilers. Other peer-reviewed studies have also reported anticoccidial effects from plant extract mixtures and curcumin-based interventions, including reductions in lesion severity, mortality, and oocyst excretion under challenge conditions. Taken together, the new paper adds a formulation-focused angle to an already active area of poultry research. (ars.usda.gov)
Why it matters: For poultry veterinarians and technical teams, the practical takeaway isn't that turmeric or long pepper is ready to displace established coccidiosis programs. It's that delivery technology may be a key variable in whether phytogenic candidates perform well enough to be useful. The study also underscores a recurring reality in coccidiosis management: promising experimental signals can disappear when dosage, formulation, challenge model, or production conditions change. This trial was small, used 74 birds total, and reported some feed intake and feed conversion data descriptively because of a lack of replication, which limits how far the conclusions can be extended. (preprints.org)
For veterinary professionals advising integrators or feed programs, that means these results are best viewed as hypothesis-strengthening rather than practice-changing. They may support future work on adjunct feed additives, especially for programs trying to reduce pressure on conventional anticoccidials or complement vaccination strategies. But the real test will be repeatability in larger commercial studies, across mixed Eimeria challenges, and against outcomes that matter most in the field: lesion control, oocyst cycling, feed conversion, secondary enteric disease pressure, and consistency flock to flock. (pmc.ncbi.nlm.nih.gov)
What to watch: Watch for peer-reviewed publication details from Veterinary Sciences, larger-scale validation studies, and any movement by feed additive developers to position solid-dispersion phytogenics as part of integrated coccidiosis management rather than as stand-alone replacements for drugs or vaccines. (preprints.org)