I've only had my chickens for 8 months, but my bantam cochins have gone broody many times already. I have 13 females and 5 have been broody. Neither of my silkies have yet but I'm sure it's just a matter of time.
Most recently, one of my black Australorps has been broody.
I would definitely recommend bantam cochins though, they've been the nicest. I'll have to see how mine do with hatching but they're known to be good mothers.
Their sure spicy though, arent they?
When she had to lay her egg, she made me carry her around the house to find a spot for her to lay, in the nesting box? To basic. in my bed, hm, ill take a nap for 2 hours and spin around in the blankets then ill decide, nope. To boring.
We went to every location (against my will for some) and she decided to go in the nesting box 4 hours later.
She did that again 3 times after.. Shes a handful.