I have a Black Cochin, just one year old this month, and she's just gone broody for the fourth time. I knew she would just keep going broody every six weeks unless I just gave in and let her be a mama. So I began allowing her conjugal visits with the Black Cochin roo right after her last broody spell, and I saved all of her fertilized eggs for this fourth occasion.
She began sitting on twelve eggs today. (It would have been about seventeen or eighteen, but I rotated the older eggs out, replacing them with newer eggs, keeping the number at twelve.) I chose my Cochin above the Wyandottes, who are also broody fiends, because she's so gentle in her broody temperament. I figured she'd also be a gentle mother hen and she wouldn't be angry when I want to pick up and cuddle her babies.
Cochins can be depended on to regularly go broody. Not much guess work and hope involved if you want a broody hen.