Very sorry for your losses.
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Are you crazy?? You don´t need to cull them. Mine have had this before and i treat with 5 days of an antibiotic and then 3 days with vitamins. You can treat it really easy.
You can even treat them all even if they are not showing any symtoms yet. Just speak to a local vet for some advice or to buy the antbiotic. It would be better the culling.