Barred Rock layed her first egg at 21 weeks, My 1 GLW waited forever till 35 weeks and the other I am not sure if she had ever laid an egg and then the poor thing died. The SLW both layed same week at about 30 weeks. Now my GLW is broody and sitting on 3 eggs and a bunch of golf balls. She is soooo proud of herself! I think I didn't give her any of her own eggs.
When I was frustrated with lack of eggs, I switched them to grower game feed and they all started laying but it easily could have just been time for them to start laying and it made their poop really stinky with all the extra protein - they are all on layena now and free range.
Caroline