I have a question, this thread has been really help full, but here's one more thing. I have a flock that are carriers of mareks. unfortunately I don't have the right type of breeds to breed my own flock, but I will be getting new birds soon. These birds will not be vaccinated. I need to know what is the chance that most will make it. I can't get vaccinated birds, as these breeds can only be found at a breeders.
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