For chickens, the typical dosage of Corid (amprolium) is 0.0125% in drinking water for 5-7 days to treat coccidiosis; consult a vet for specific guidance.
Corid (amprolium) is the most effective treatment for coccidiosis in chickens. This parasite causes bloody diarrhea, weight loss, and death if untreated. Proper dosing is critical – too little won’t work, too much can cause vitamin deficiencies.
Corid Dosage for Chickens
The correct Corid dosage depends on outbreak severity and product form (liquid or powder). Always use fresh water daily during treatment.
Liquid Corid (9.6% solution)
| Severity | Dosage | Duration |
|---|---|---|
| Prevention | ½ tsp per gallon | 21 days |
| Moderate outbreak | 1 tsp per gallon | 5-7 days |
| Severe outbreak | 2 tsp per gallon | 5-7 days + ½ tsp for 7-14 days |
Corid Powder
| Severity | Dosage | Duration |
|---|---|---|
| Prevention | 1/3 tsp per gallon | 21 days |
| Moderate outbreak | 3/4 tsp per gallon | 5-7 days |
| Severe outbreak | 1.5 tsp per gallon | 5-7 days + 1/3 tsp for 7-14 days |
Key Treatment Rules
- Make fresh solution daily – it degrades in sunlight
- Remove all other water sources during treatment
- Don’t give vitamins until after treatment (they feed the parasites)
- Treat entire flock – coccidia spreads quickly
- Follow severe outbreaks with preventive dose for 1-2 weeks
Recognizing Coccidiosis
Watch for these symptoms, especially in chicks under 12 weeks:
- Bloody or watery diarrhea
- Pale combs/wattles
- Lethargy and huddling
- Weight loss despite eating
- Ruffled feathers
Diagnosis requires microscopic fecal exam. If you see symptoms but can’t test, treat immediately – delays can be fatal.
Post-Treatment Care
After Corid treatment:
- Give vitamin supplements for 3-4 days (especially B1)
- Add probiotics to restore gut health
- Clean coop thoroughly – disinfect all surfaces
- Monitor for recurrence (common in damp conditions)
Prevention Tips
Reduce coccidia risk with these measures:
- Keep bedding dry – change weekly
- Use nipple waterers instead of open bowls
- Provide adequate space – overcrowding spreads disease
- Quarantine new birds for 2 weeks
- Consider medicated starter feed for chicks
Safety Considerations
Corid is FDA-approved for laying hens with no egg withdrawal period. However:
- Meat chickens require 24-hour withdrawal before slaughter
- Don’t use with other medications
- Overdose can cause thiamine deficiency
- Store in cool, dark place (expires 1 year after opening)
For more on chicken health, see Merck Veterinary Manual or consult an avian vet.
Natural Alternatives
While less effective than Corid, some keepers use:
- Apple cider vinegar (1 tbsp per gallon water)
- Garlic in feed
- Probiotics and oregano oil
- Diatomaceous earth in dust baths
These may help prevent outbreaks but won’t cure active infections. Always have Corid on hand for emergencies.