Quote:
I guarantee you the inside chicks with no exposure to the outside are pooping coccidia. You can put them in a sterile indoor brooder with sterile litter and sterile food and water, to start with, but once they start pooping in there, if they eat too much of their own poop, they are going to get coccidiosis. Coccidia is not in the soil, it is in the chick. It gets in the soil or litter from the chick, not the other way around. The chick eats its own poop, or the poop of the other chicks and it overwhelms their system and they get sick. Indoor, outdoor, sterile brooder or not. Obviously, exposure to a ground that is already covered with other chickens' poop will have that much more coccidia exposure.
Indoor chicks with a sterile brooder (to start with) can build up immunity to coccidia just like any other chick unless you keep the brooder too clean--which is probably nearly impossible. Chicks raised on wire, for instance, are more likely to come down with an infection once put on the ground than chicks raised on litter since they do not have as much access to their poop and therefore do not consume enough for the coccidia to build up in their system and give them immunity.
I am not saying you shouldn't medicate them. I am just saying, in my opinion, you don't have to if you manage their environment, whether it is indoor or outdoor.
UGCM