My silkie goes broody all the time, so does my game hen.
The others never have.
Recently, I gave my silkie a chick to raise. She was scratching and clucking at it to eat food etc. It was funny, because one of my 8 year old RI (production) started fluffing her feathers and doing the mama hen cluck and scratching. She had never displayed this behavior before. I thought, oh, Cotton has shown her how to be a mama. But, she has stopped now.