I opened a new bag of feed the evening before last. Yesterday morning, had 3 dead birds. The rest did not come running to me, like usual, when I cam to feed them. None would eat all day. Lost 2 more yesterday. This morning woke to 6 more dead. They have blood coming out of their butts. I think I got a bad bag of feed. They are 7 weeks old. We were going to butcher next weekend. Any thoughts?