I would rule out any residual illness and then consider time of year. Alot of hens are off laying due to change of season, I know mine are. Molting will cause slow laying too, look around the yard for dropped feathers. 2 year olds are going to be slowing down a tiny bit due to age, and 5 month olds are just getting started, so they may lay erratically at first.
Most birds will take a day or two off after laying for 5 or 6 days as well. Yours may just all be taking a break at the same time.
If you just got them, the eggs you got may have just already been in their systems, and now they are stopping or slowing as they adjust to their new digs.
If no one is sick, or molting, I would guess its seasonal or new enviroment. Give them a week or 2 to get back on track.
Oh, and you have WAY to many roosters for 7 hens- that many will stress the hens out with constant breeding attempts as well as tear them up with their spurs. Personally, I would only have 1 roo for 7 hens. If you arent breeding, I would suggest you get rid of all the roo's for awhile. You can always get new roos- theyre everywhere and often free.
