I currently own Runners and love them but was thinking of getting some Pekin ducks. Is it possible to breed the larger Jumbo Pekins with the regular ones to get a good in between size Pekin? I love the idea and hardiness of the Jumbos since winters are a bit brutal where I'm located but am aware of the leg issues due to the heftier weight. Also, what are the white crested ducks available on the big hatchery sites? Are they just crested Pekins?