My goose is laying - again - but most eggs are either shellless or have a very thin shell. She has access to crushed oyster shell but she rarely touches it. I've tried mixing it in her feed every evening (during the day she grazes), but every morning the food pellets are gone from the bowl, leaving only a pile of oyster shell. She's excellent at sorting... Then I baked her some treats out of flour, oatmeal and oyster shell. And guess what - she loves them! But now that I'm tricking her into eating the oyster shell, I'm concerned that she'll eat more than her system can handle. Is there such a thing as "too much oyster shell"? Or will the excess just pass through?