Hens go broody when you don’t want them to… and won’t go broody when you do. 
Hey BYC, I have three full grown chickens, one rooster and two hens. I also have 7 week old pekin ducks that I would like to have live with them. I worry that the rooster would try tl mate with them and pull out some of their feathers and scratch them up. How would I even go about introducing them to ducks?
