I just bought my first pair of barred rock chickens. This is a first for me. The lady I bought them from said that I should keep them in the run and coop for the first week. They came from a much bigger coop and run into my small coop and run. Also, they were used to being let out to graze ever afternoon. I feel bad having to keep them locked up for a week. Do you really have to keep them confined for an entire week? Are they going to try to run off or fly off the minute I let them out of the coop? How long should I leave them out in the pasture for the first time?