The Witts do both: They mix their own feed from grains and sunflower seeds, and serve unmedicated layer pellets to their adult ducks at laying time. ???Medicated feeds aren???t necessary for ducks and can cause health problems,??? Brian Witt says.Such a basic diet as the Witts use can be supplemented with vegetables, fruit and other table scraps, however, never feed moldy food items, a practice th