The medication I use the most is corid. In the wet, wet, humid, swampy south I have terrible problems with coccidia. I know a big breeder here that keeps her chicks on medicated feed and wire for the entire first 4 months. I just can't do that to them! I am going to have to be more proactive about exposing them to the particularly virulent strains of coccidia we have here from hatch. If a broody hen can do it, surely I can eventually figure it out. I'm curious if this will be the end of medicated feed without a prescription as well as Amprol.
In my now considerable experience with Isbars and coccidia (way too much experience), they seem particularly susceptible as chicks and they do not do well on medicated feed either. It is always a struggle to get them out on the ground and live through it (where I live anyway). If they make it to 4 months, they are some of the sturdiest chickens I have. Snow, ice, rain they are out in it. We had an 8 inch snow recently and my little isbar rooster was like a snow plow running from coop to coop checking on everybody else who wouldn't come out. It was pretty hilarious.
Glad we don't see that problem here. In fact, I've never known anyone here that has had coccidia in their flock..man, I'm pounding on my wood desk top!
I don't even give my birds the medicated feed for too long, they get too runny on it. When I give it to them in the beginning, I mix it with the reg. chick feed so they get it, but not as much at once.
Love love the picture in my mind of that rooster running back and forth in the snow checking oh his girls!