My new 1st hatch this year. Dad is an Olive egger {Splash maran X Americana} Mom's are all Green egg layers {EE,OE and Ameraucana}
I have never had a EE or Ameraucana go broody. So I use my BCM and BO to brood. Those two hens stay broody as long as the weather is warm.
Out of 13 eggs 3 chicks got as far as getting their beak out of the shell then quiet and 1 egg wasn't fertile. So not a bad hatch from the BCM 9 of 13.
The BO hatch is due on 30th. She did great last year. 14 out of 15 made it. Hoping for a good hatch from her. She is sitting on all blue/green eggs.