I ordered some baby chicks awhile ago and they’re expected to get here on Thursday so I got Putin’s flockraiser for the baby chicks and the full grown ducks. I forgot to get oyster shell to go with and just barely ran out of layer feed and just got back from tractor supply. 
So before my next trip to Tractor supply I’ve ground up some egg shells for the time being but I was wondering how much egg shells will five laying ducks need?(Runner , two Rouen's, and two Muscovy) Thanks for the help!

