Out of 10, now I'm down to 4 after two weeks. They have proper heat. They have plenty of water. No sign of disease on any of them now. When I check in the morning, they all look healthy and great. 12 hours later, one will be dead. I'm at a loss. The only thing I can think of is that the feed store feed that I have is 20%, which is the highest they had. I know 28% is optimal, but that shouldn't be killing them, should it?