I've had my 4 Isa Warrens since October 2009, they have always been good layers giving me at least 6 good brown eggs per week each. My problem is this past week the quality of eggs has dropped dramatically, I have been receiving a few white shelled eggs with quite a rough surface to the shell and today there was a very small egg maybe only around the size of a 10p piece. I went out to the coup later and had a soft shelled egg (merely a membrane), is there something wrong with my chickens and is there something i should be looking out for. There has been no change in their food but have not been letting them free range just as much and their diet consists mainly of layers feed and a few scraps. Its been a bit colder lately and wonder if this would have any effect on egg quality.