I recently aquired 4 "laying hens", (2 barred rock, 2 RIR's) I've had them for a week now, they came from, what I would consider an overcrowded enviroment. They were timid the first 3 days or so and would not leave the coop, its now been a week and nothing, they are fairly large birds, I do believe they are mature and should be laying, any suggestions?