So I have two female rouen ducks, and two male emden geese. Right now they are all on Purina Flock Raiser, but when the ducks start laying eggs, do I keep them all on purina flock raiser and supply oyster shells? Or so I put them on the purina layena. I don’t really have a way to separate them and it would be very hard to. But I know you’re not supposed to give it to males. I don’t know what to do. My geese want to eat everything the ducks eat so I doubt they would avoid eating the oyster shells. Help please I’m new to waterfowl and need some tips.