Until a few days ago I had two healthy and ready to deliver pregnant does. About 3 days before they were to deliver, I put into each nesting box a good supply of new timothy grass purchased the day before in a plastic bag from a local feed store. Less than 2 days later I found one of the does had passed. I went to check on the other doe and she was nearly gone. When I touched her tummy she cried. I noticed each doe had eaten half of the grass in the nesting box and very little or none of their pellet food. Has anyone ever seen this problem before? I've taken this same action in the past a few times and have never had it happen until now. Any advice much appreciated. Thanks in advance.