Meat Birds (cornish cross) possibly sick and dying

[lafavekaylin]

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Hello, I have raised meat birds for 5 years now twice a year. We usually get between 50-60. This year we had 61. We are now down to 41. They have been dropping like flies. I have changed nothing from how I have always raised them. They are in a huge tractor that gets moved daily. They have 24/7 access to water and get fed twice a day now. They are 6 weeks old. The first couple that died seemed to start breathing really hard before finding them dead. Now some of the smaller ones turn purple and die. I tried treating for coccidiosis with corid as I seen some blood in the stool but could tell if was already for the dead ones I found because I noticed when I take them out after they have passed there butts are all red and bloody. I'm so lost and have never had more than two die before of what I believe to be heart attacks. The last one to die shook its head weird and was breathing heavily as well. I'll try to attach pictures but any advice would help. I also want to know if it's safe to butcher and eat them as were getting close to butcher day?

 

[lafavekaylin]

Red circle is one that ended up dying he was smaller and purple.