I put out free choice crushed oyster shell for my duck (I feed them all flock feed so supplement with oyster shell) but it has been rainy and snowy here in Nebraska. The oyster shell is wet. I stir it up, but just wondering if that is ok to put out wet. I don't know what much about oyster shell other than it is a good idea to give it to hens and duck to ensure good eggs shells. I do only give them DRY feed. Help?