My son has some 6 month old partridge cochin bantams. One is exhibiting some signs of broodiness. I've been wanting one to go broody, leaving eggs in the nesting box for 2 days or more at the time. One nesting box was the only one they were laying in. Finally, I decided to move a few eggs to a different nesting box to see if I could get one to go broody, and it seems to have worked. How long will she have to sit on the eggs before I know she's broody? When should I move her to a box isolated from the others? Also, when I move her, I want to swap out the eggs (the ones she is on are probably not fertile--I want to put some fertile RIR eggs under her). How do I go about doing this, and how many RIR eggs (large fowl) should I expect her to be able to incubate and hatch? Thanks.