First of all, if you want them breeds be prepared for a broody! All hens will be picked on at the start until they are accepted into the flock. You can spray them with anti-peck spray when you put them in with your leghorns, but i would put them in with them until 16 weeks old. Good Luck!
Haha as long as they're nice most of the time. Do those cochin breed feather up fast? Will all those feathers give the illusion that they are as big as the thinner leghorns? I know being picked on is inevitable. I didn't know there was a thing like anti-pecking spray, that's crazy! I think the longer we wait to get chicks, the longer it'll take to integrate them.
Not sure about cochins. But i have Buff Oringtons. I first got two which stuck up for themselves when i got them and everything settled within 2 weeks. One of the girls then went broody and hatched out a Buff Orpington female and she was fully feathered at 5 weeks. Once she was about 20-22 weeks old she started fighting for a place in the pecking order.
It doesn't make a difference if a hens eggs is fertile or infertile. If she want to be broody, she will be broody!
