Using smoothis very common, we do it too. At the age those goslings are though you don't know if they are curly or smooth. You can't show a smooth since they are not currently reccognized in the SOP. So to buy a day old white with a possible smooth parent would give a chance of a smooth off spring. Smooth is smooth breasted, not smooth all over, but they couldn't be shown. I wish the American SOP would catch up with the times since smooth and buffs both are reccognized over seas.
Gracie has nice adults, and using the smooth is thought to help avoid twisted wing tip. The babies would have to be starting to feather to know if they would be smooth or curly though. Both are useful for breeding, only the curly whites are reccognized by the SOP.