I'm at a loss. We bought about a dozen chicks at a swap. We had approx. 40 delivered from McMurray's - rare breeds, etc. We mixed them. On Day 1 they started to die. Day 2 they were dropping like flies. McMurray's suspected the problem was that I was using alfalfa. They credited a refund for the dead ones within the time period. Unfortunately none of my swap chicks died, just McMurray's. We lost 13 the first few days. We gave them antibiotics and they stopped dying. Fast forward about 4-5 weeks. In our older broiler chicks we've been seeing some blood in the stool, but they had been out free ranging and had gotten some black oil sunflower seeds from the bunnies. The little laying breeds had NOT been free ranging. We were a little concerned that they had cocciodosis and they aren't putting on weight as fast as they should. We lost two of those. They went down first, and the next day died. We've not seen ANY blood in the laying breeds poo nor is it loose, it's normal. But we're losing them. A LOT of them. We've lost another dozen at the rate of 1-2 a day and we are down, from the beginning of about 50+ chicks to about 16. I've never lost this many chicks in my life. They've received electrolytes and they've received antibiotics. WTHeck is this? I'm at a loss. I'd just write off the rest, they're almost entirely only swap chicks left at this point, the McMurray ones are pretty much all dead with the exception of about 4. BUT I have laying stock coming next week. I have rare breed laying stock coming in to the tune of almost $200 worth and I'm deathly afraid they're going to get whatever this is. I'm seriously considering killing all of them, burning them, and bleaching everything. Suggestions would be appreciated more than you know.