I was trying to hatch some out they did not make it but I did get some info before I got started.
Every year the cock birds loose their tail feathers, the hens may continue to lay eggs but they will not be fertile. I know that it is normal for them to loose them, just not sure on when.
ETA,
if you want the guys e-mail addy I can give it to you, he is a HUGE breeder.