Ducks need layer feed or oyster shell?

[Miss Lydia]

I have waterfowl and chickens and they all eat together and live together it’s nice to be able to use one feed. I keep oyster shell out year round since a few lay through winter. They know how much they need.

 

[chickens really]

I feed Grower finisher feed for chickens, Ducks, geese and Turkeys. It's 16% protein. I supply Oyster shell in a separate dish once a week.