I'm having the exact same problem. This is my third batch. Lost one in the first batch early. Lost two around 6 wks last batch. third batch, lost 4 this week and they are just barely past 6 wks. I lost 3 in the first week, but that happens. First two batches I butchered at 8 wks. And the thing is the birds that are dying now are smaller than the others. And overall the birds are smaller than the last two batches. First two batches came from McMurrey, last from another hatchery ~ can't remember the name, starts with a "sch". I thought maybe feed is an issue, don't know. First batch started on chicken starter, switched to turkey starter for last four weeks. Batch two used turkey started the entire time. Some one told me to just reverse what I did on the first batch and start with higher protein then go to the chick starter. Quite frankly, I think I'm just going to go back to buying at the store, it's cheaper and I get the parts I want without the hassle.
Renee
S CA
Renee
S CA