Can someone PLEASE tell me what's going on with my chickens? One is laying only shellless eggs, another (a bird barely a year old) stopped laying for 3 months and has just begun again, and the third lays well, then stops and when she stops, there is yolk in her poop. I've taken one to the vet ($168) and they were useless and they have all the oyster shells they want, but only one seems to be eating them. I love my birds, and I want them to be healthy. Thanks.