I bought 7 RIRs (3- 19 wks and 4- 12 wks), a 9 wk leghorn and a 24ish wk silver Wyandotte about 9 weeks ago. The Wyandotte finally started laying at about 32 weeks and I don't think any of the others have laid anything. The first egg we ever got was larger and a smidge darker than the last three we got so it may have come from one of the RIRs but we haven't got another like it in almost 2 weeks. The Wyandotte laid the other three we got. My RIRs are now 28 and 21 weeks and still no eggs. The 3 older RIRs all have dark red combs, and as of this week at least one is squatting. The breeder who I bought them from said that his 24 weeks RIRs were laying. So why aren't mine? Food? We were feeding them twice a day, but thought maybe they weren't getting enough food or were stressed from running out of food so about a week ago we switched to continuous feed. They get commercial layer feed, are allowed to free range in the evenings and get garden and kitchen produce scraps. Water? They always have plenty of water Stress? We do have two dogs, but they never bark at them. Neighbor dogs sometimes bark at them from their yards. We used to let our kiddos play with them (they would chase them around the yard and pick them up gently) but have stopped that incase it is causing stress. They don't seem to be diseased or anything. I have at least one RIR who is squatting. About 10 days ago we got our first egg. It was laid in the middle of the run, larger and browner than the wyandotte's. We haven't gotten another like it. could this have been one of my RIRs? Why would they lay 1 egg and then no more in 10 days? My now 20 week RIRs still have light, small combs. Could my birds be maturing more slowly for some reason? I have asked everyone I know who has chickens and no one has a clue why my older birds wouldn't be laying yet. Does anyone have any insight?? thanks!