could this be merak's disease?

[24jr31b]

oh ok..some were green and runny others were rust colored anf foamy looking, are those normal?

 

[Eggcessive]

I would probably treat everyone since Corid is not harmful to chickens. Older chickens are usually immune to what's on the farm already, unless new girls show up with new strains, or somebody tracks a new strain in on their shoes. Any new hens should be treated when they arrive since you have it in the soil.

 

[casportpony]

Due to some confusion on dose amounts regarding the powder, I decided to do some research and this is what I have so far. For those of you that use powder Corid, if you have been using 1/2 teaspoon per gallon (~280mg) you haven't been using enough.

The preventative dose (.006%) for Corid Powder is 1/3 teaspoon.
The preventative dose (.006%) for Corid liquid is 1/2 teaspoon.

The moderate outbreak dose (.012%) for Corid Powder is 3/4 teaspoon.
The moderate outbreak dose (.012%) for Corid liquid is 1 teaspoon.

The severe outbreak dose (.024%) for Corid Powder is probably at least 1.5 teaspoon, but I haven't done the math for it yet.
The severe outbreak dose (.024%) for Corid liquid is 2 teaspoon.

Corid mixing instructions for preventative and moderate outbreak dosing.
http://www.corid.com/SiteCollectionDocuments/CORID Slim Jim-All.pdf
Amprol 20% powder:
http://www.asp-inc.com/products/documents/prodinfo/a/amp128.pdf
Amprol 9.6% liquid:
http://www.asp-inc.com/products/documents/prodinfo/a/amp96.pdf

FDA recommendations:
http://www.accessdata.fda.gov/scripts/animaldrugsatfda/details.cfm?dn=013-149
"Chickens
Indications: For the treatment of coccidiosis.
Amount: Administer at the 0.012 percent level in drinking water as soon as coccidiosis is diagnosed and continue for 3 to 5 days (in severe outbreaks, give amprolium at the 0.024 percent level); continue with 0.006 percent amprolium-medicated water for an additional 1 to 2 weeks."

And this link has these instructions:
http://www.drugs.com/vet/amprol-9-6-solution-can.html
"Poultry - as Soon As Caecal Coccidiosis Is Diagnosed, Give 0.024% Amprolium In The Drinking Water For 5 To 7 Days. Continue The Treatment With 0.006% Amprolium Medicated Water For An Additional One To Two Weeks. No Other Source Of Drinking Water Should Be Available To The Birds During This Time."

-Kathy

Disclaimer:
In the past I have treated my chicken chicks with 2 teaspoons of the liquid for 5-7 days, that's it, but I *might* try the .006% follow up the next time I have to treat chicks.