I just had another partridge rock go broody and a barred rock go broody, and two bourbon red turkey hens go broody.
I'm terrified there's something in the water and I'll go broody.
My broodies - free range, two are out there now with 19 or 20 between them - little suckers won't hold still enough for a full count. Man they chase every other chicken 20ft off the chicks and they MEAN it. The delawares are terrified.
I guess the white sticks out to the PRs, the delawares hardly get a chance at the yard while the mothers are there, fortunately they've begun to drag the seething little pack further and further from the coops now.
The best breed? The ones that will do it. While some are more predictably and commonly broody some in those breeds also do it poorly or not at all, chickens like people are each different and don't read the books on how they're to behave.