No special preps when the yb's go to their own loft. Food is a bit smaller in size, just for a couple of weeks and then eat the same as the older flyers. At the end of the day pigeons eat what they like..........just as humans. You hear fanciers telling "my birds leave no grain", probably cuz they are starving. Mine leave what they don't like. These leftovers go to the ducks in the park. They just love it.