No bread, of any kind, has any nutritional value for ducks. By feeding them bread, it fills their stomachs while providing no nutrients. It’s essentially the equivalent of humans eating cotton balls, or grass. This also goes for such snacks as tortilla chips, regular chips, pretzels, cheesies etc. The oil, salt, and/or flavoring on any human snack is no good for ducks. This is especially important for the wee ones during the breeding season, while they’re growing.