I have 8 pullets (and some roos) and some are just starting to get to laying age (they're all 20 weeks this week). I have two exchequer leghorns that I expect a first egg from soon, and the others are breeds that I don't expect and egg from for at least another month. The leghorns have been disappearing a lot recently. They fly the run sometime during the day and at least one doesn't usually come back at night (I need to get netting up to cover the run and stop that). I've tried looking for them but they just can't be found, then when I go out in the morning to let the others out and give food/water...they're there just wandering around. I haven't seen an egg from either of them, but I suppose they could have started a bit early and they're running off to sit on some eggs? I haven't been able to catch them in the escape to follow them and I don't want to pen them up starting now just in case they ARE sitting on fertile eggs (are the first few eggs even usually fertile?).