For chickens, mix 1 ounce of Corid (amprolium) per gallon of water for treating coccidiosis, ensuring they have access to this solution for 5-7 days.
Corid (amprolium) is the most effective treatment for coccidiosis in chickens. The correct dosage depends on whether you’re preventing or treating an outbreak. For severe cases, use 2 teaspoons per gallon for 5 days, followed by 1/2 teaspoon for another 7 days. Prevention requires 1/2 teaspoon per gallon for 21 days.
Understanding Coccidiosis in Chickens
Coccidiosis is caused by protozoan parasites that attack a chicken’s intestinal tract. Young birds under 12 weeks are most vulnerable, but adults can carry and spread the disease. The parasites reproduce rapidly in warm, moist environments – making proper coop hygiene essential.
Symptoms to Watch For
- Bloody or watery droppings
- Pale combs and wattles
- Lethargy and huddling
- Ruffled feathers
- Reduced appetite
If you notice these signs, act quickly. Coccidiosis can kill chicks within 24-48 hours of symptom onset. For more on chicken health issues, see our article on why chickens die suddenly.
Corid Dosage for Chickens
| Purpose | Dosage (9.6% solution) | Duration |
|---|---|---|
| Severe outbreak | 2 tsp per gallon | 5 days |
| Moderate outbreak | 1 tsp per gallon | 5-7 days |
| Prevention | 1/2 tsp per gallon | 21 days |
| Follow-up treatment | 1/2 tsp per gallon | 7 days |
Important Treatment Notes
- Corid water must be the only water source during treatment
- Mix fresh solution daily
- Remove all vitamin supplements during treatment
- Continue normal feeding
Post-Treatment Care
After Corid treatment, chickens need vitamin supplements (especially B1/thiamine) for 3-4 days. Corid works by creating a thiamine deficiency that kills the coccidia parasites. Good options include:
- Rooster Booster Poultry Cell
- Nutri-Drench
- Electrolyte solutions
For natural prevention methods, consider adding apple cider vinegar (1 tbsp per gallon) or crushed garlic to their water weekly. While not scientifically proven, many farmers report success with these methods.
Frequently Asked Questions
Can you eat eggs during Corid treatment?
Yes. The FDA approves amprolium for laying hens with zero withdrawal period for eggs.
How soon should you treat after seeing symptoms?
Immediately. Coccidiosis progresses rapidly in young birds. If you see bloody droppings in chicks, begin treatment right away.
Can older chickens get coccidiosis?
While adults usually develop immunity, stress or poor conditions can make them susceptible. Learn more about introducing chickens to new environments to reduce stress.
Preventing Future Outbreaks
Good management practices reduce coccidiosis risk:
- Keep bedding dry and change frequently
- Provide adequate space (overcrowding spreads disease)
- Use wire flooring or rotate pasture areas
- Quarantine new birds for 2-3 weeks
- Clean feeders/waterers regularly
For more on creating ideal conditions, see our guide on coop size requirements.
When to Consult a Vet
Seek professional help if:
- Birds don’t improve within 48 hours of treatment
- Multiple deaths occur
- You’re unsure of the diagnosis
- Other symptoms appear (respiratory issues, neurological signs)
For severe cases, vets may prescribe stronger medications like sulfa drugs. Always follow label instructions and withdrawal periods for meat birds.
Alternative Treatments
While Corid is most effective, some alternatives include:
- Sulfa drugs: More potent but require egg/meat withdrawal
- Probiotics: Help restore gut health after treatment
- Vaccines: Given to day-old chicks at hatcheries
Remember that natural remedies alone often fail against active infections. As noted by Merck Veterinary Manual, amprolium remains the gold standard for treatment.