To dose Corid for chickens, administer 1.5 teaspoons (9.6 g) of 20% solution per gallon of water for 5-7 days to treat coccidiosis effectively.
Coccidiosis is one of the most common and dangerous diseases affecting backyard chickens. Corid (amprolium) is the most effective treatment available. This guide covers everything you need to know about dosing Corid for chickens, with expert insights beyond basic instructions.
Understanding Coccidiosis in Chickens
Coccidiosis is caused by protozoan parasites (Eimeria species) that attack a chicken’s intestinal tract. The disease spreads through contaminated droppings and can kill young birds within days. Symptoms include:
- Bloody or watery diarrhea
- Pale combs and wattles
- Lethargy and huddling
- Reduced appetite
- Weight loss
Chicks aged 3-6 weeks are most vulnerable, but adults can carry and spread the disease. Proper coop hygiene is key to prevention – learn more about introducing chickens to a clean coop.
Corid Dosage for Chickens
Liquid Corid (9.6% solution)
| Situation | Dosage | Duration |
|---|---|---|
| Severe outbreak | 2 tsp per gallon | 5 days |
| Moderate outbreak | 1 tsp per gallon | 5 days |
| Prevention | ½ tsp per gallon | 21 days |
Powdered Corid (20% concentration)
| Situation | Dosage | Duration |
|---|---|---|
| Severe outbreak | 1.5 tsp per gallon | 5 days |
| Moderate outbreak | ¾ tsp per gallon | 5 days |
| Prevention | ⅓ tsp per gallon | 21 days |
Treatment Protocol
For best results:
- Use as the ONLY water source
- Change solution daily
- Treat entire flock
- Follow initial treatment with preventive dose for 1-2 weeks
- No other medications or vitamins during treatment
According to FARAD, this protocol ensures complete eradication of coccidia.
Important Considerations
Withdrawal Periods
Corid has:
- No withdrawal period for egg layers
- 24-hour withdrawal for meat birds before slaughter
Vitamin Supplementation
After treatment, provide vitamin supplements (especially B1) for 3-4 days. Corid works by creating a thiamine deficiency in parasites, which can temporarily affect your chickens too.
Prevention Tips
Reduce coccidiosis risk by:
- Keeping bedding dry
- Providing adequate space
- Using pecking deterrents to prevent stress
- Quarantining new birds
Alternative Treatments
While Corid is most effective, some keepers use:
- Apple cider vinegar (1 tbsp per gallon)
- Garlic in water
- Probiotics
According to Merck Veterinary Manual, these may help but aren’t proven cures.
When to Call a Vet
Seek professional help if:
- Symptoms persist after treatment
- Multiple birds die suddenly
- You’re unsure of the diagnosis
Remember that other diseases like sudden chicken death syndrome can mimic coccidiosis symptoms.