It is a little tough to know how much they are getting because of spillage, if I recall ducklinghood correctly.
Sounds like you are doing fine - if you are using chick starter and grower, you may want to add a tablespoon per cup of brewer's yeast (not baking yeast) to their food for a few weeks just to insure against B vitamin deficiency (some ducklings are sensitive to it, some not).
Sounds like you are doing fine - if you are using chick starter and grower, you may want to add a tablespoon per cup of brewer's yeast (not baking yeast) to their food for a few weeks just to insure against B vitamin deficiency (some ducklings are sensitive to it, some not).