I had a hen that was broody for about five or six weeks, she was determined
I don't have a cckerel either but it's their instinct, we put a run within the main run and put her in their with no straw or anything that could be used to make a nest, she stayed in there night and day, after about 5 days with no eggs to steal (they don't lay whilst they're sitting)and no nest she snapped right out of it, the trouble is if they are persistent for more than the 20 plus days they will start to lose condition, but apparently she was quite an exception :roll: good luck