Welcome to BYC, Jessica.
Don't mix the oyster shell in with their feed. Just put it in a seperate dish, and let them have access to it free choice. They will take what they need, when they need it and you'll have better quality eggshells. Also keep in mind that their first eggs may be very small and have some glitches, such as thin or nonexistent shells.
Don't mix the oyster shell in with their feed. Just put it in a seperate dish, and let them have access to it free choice. They will take what they need, when they need it and you'll have better quality eggshells. Also keep in mind that their first eggs may be very small and have some glitches, such as thin or nonexistent shells.