I was getting 12 to 15 eggs per day consistently and over the weekend they have stopped. I got no eggs on Sunday and only two on Monday. My flock consist of about 6 hens that are reaching 24 months and 18 hens that are anywhere from 6 to 9 months old. The weather here is 60's at night and 80's in the day. What are the possible cause? I know the older girls are not consistent but the young ones should not be moulting. Any ideas?