hi there are a number of different reason that i know off y they dont lay eggs one is there age how old are they ?
what kind of feed is it a mash or a pellet this can some time cause problems
being egg bound is another try adding cod liver oil to the feed as it can help slide the egg out lol
how much water have the drank have they remaind moving arund and moble
have there been any stress as hens are extreamly stressed animals when they come into egg production the slightist thing from a fox scare to loud bangs is know to put them off laying perfect example of this is local to me there is an organic poultry farm everything was ok getting good aount off eggs untill low flying air craft to the now used airfield started going over again it caused the bird to stop laying and has cost the farmer thousnads hes now sueing the airfield let me know