Thank you for updating and the warning againsy hay. I was going to get a bale of alfalfa--I had no idea this was dangerous. Thanks.!
This isn't an issue all the time. We feed our girls a flake of alfalfa hay regularly (several times a week). They go nuts scratching it apart and seem to eat the fragile leaves and leave the stems behind.
We have not had any problems (knock on wood) and the alfalfa makes their yolks beautiful orange.