@flyladyrocks
Here is the old article on brooding w/deep litter:
http://www.plamondon.com/faq_deep_litter.html
I DO NOT RECOMMEND USING LIME. PLEASE DON'T USE LIME! or any other additives.
When I brought my new babies home last time, I let them settle in a day or 2 in their box. After that, I brought in a handful of litter from the floor in the regular coop and put it in with the litter already on their box floor. Every few days I'd add a little more of the litter from the regular coop until after about 1.5 - 2 weeks it was predominantly litter from the regular coop.
This is an important step, along with the sod plugs, as it helps their immune system build for the items they will be put into when they go out with the rest of the gang. The studies seem to show that when most chicks get cocci, it is when they are first put out in the regular coop around 6 weeks of age, having come from no exposure at all. The immunities are supposed to be building from day 1 by being exposed to the environment while they still have some of the immunities that come with the hatch.
Interesting thing in that article is that they believe one of the reasons that the deep litter helps is that it has ammonia...as it has been proven to kill the cocci parasite. So... NOT IN EXCESS, but in small amounts, ammonia in the litter is a good thing. (OF COURSE, IT MUST NOT BE STRONG TO CAUSE RESPIRATORY PROBLEMS.) But that bit of ammonia in the built up litter is good when in moderation.