I have 7 leghorns that are about 6 months old. They had been laying on a daily basis for about a month and then all of a sudden about two weeks ago they all stopped. I literally got 7 eggs from the leghorns one day, which was the usual, and then haven't gotten a single one since. The aren't sick as far as I can tell and I don't suspect any mites, as I haven't found any and the rest of the flock (different breeds and ages) are all still laying without interruption. I live in the south so the temperature went from about 100 degrees/day to about 80 degrees/day and from about 15 hours of sunlight to about 12 hours at the time they stopped laying. They are on layer food with oyster shell and they get occasional treats, like yogurt, but only once or twice a week. They are not free range so I know they aren't hiding the eggs. Anyone have any thoughts as to why this is happening. This is my first year with chickens so I don't know what's normal and what isn't, but I find it strange that all the others are still laying and all the leghorns stopped.