When I butchered my first batch of Swedish, they were completely lean. Not one drop of fat on them. So I added some cracked corn to the diet of the remaining ones to see if I could get some fat on them. They turned out perfect. Just a little fat. Enough to make them easy to cook. The Pekins, however, did not need that corn. They put on fat easily and would have been fine without the corn. Because they get plenty of exercise and fresh air, they didn't turn out too fat, but they were definitely plump. I've eaten Pekin that was raised in confinement and they were greasy to the point of being almost inedible. Mine turned out really nice. They will make a nice crispy skinned roast duck. But they really didn't need that extra corn.