Stumped with a sick cockerel...

You can give 250 mg (1/2 of a 500 mg tablet) orally daily for 5 days, according to Plumbs Veterinary Drug Book.

I have a closed flock as well, and one of my 7 year old hens has become the first I have had to show Mareks signs. It is still unkown, but she even had the vaccine as a chick.
 
It’s not Meraks, I guarantee it’s not.
I totally agree. He’s been in the house for a couple weeks, and we have 5 Seramas in the same room who are happy and healthy and laying eggs consistently. No one outside is sick either.
 

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