So you say 10 weeks is right for the cockerels to start crowing? I didn't know that... Thanks. I don't have an outside coop as I never intended to keep chicken (I hatch and give away for free to elderly people - it is a charity thing I am doing). These just happened to stay with me longer than usual but I'll give them away too. We have winter here now, so all the chicken are outside free in the garden (no fence, no enclosure) during the day, but when the temperature drops to 5-6C they go inside, I have a room for them, kind of like a garage with lots of windows. It drops to - 5 -10C during night, so they stay in the room where it is warmer.
BTW I have 3 neighbors with Leghorn hens but none has a Leghorn rooster, don't know why they are not preferred.