I'm not a believer in this notion of non broody breeds. The drive to procreate is so fundamental that if anyone did, or does manage to breed it out of a chicken then they don't have a chicken any more.Most of my girls are non-broody breeds and so far have held true to that, which I’m thankful for. Even though I would loooove bunches on top of bunches of chicks, I can’t let myself have that. When it comes to anything that falls under “being my responsibility,” I become a control freak and everything has to be just so so. That is one of my downfalls. Luckily as I age I am mellowing just a bit, but the OCD is still there. I have realized the 37 birds I have right now are my upper limit...as far as keepers. However, I am not ruling out hatching some and selling them, as layers and excess cockerels.
I had read that broodies do go into a trance-like state when setting and I did notice that about my broody. She was very determined not to leave the eggs at all, and I was even more determined that I was going to remove her once each day. I suppose part of the stubbornness I witnessed was partly her trance as well.
What does happen is this drive gets suppressed by the keeping arrangements. Prior to me taking over the care of the chickens here not a single hen had gone broody in many years. Now they all go broody. While I don't know of any method that will ensure a hen goes broody, there are a few options that tend to encourage it.