I have a doe whose kids seem to get enlarge thyroids. She had twin bucklings last year that I noticed it in and now this year a single doeling. I did add iodinized salt blocks and they have goat blocks and I have been adding additional minerals to the creep feeder. None of the other kids are having problems, just this doe's offspring. Has anyone ever heard of this? It doesn't seem to cause any problems, just swelling of the thyroid. I will be doing more searching on this. Thanks.