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I have been breeding chickens for 5 years, and the 1st 2 years had no problems, and then suddenly one year I have several birds come down with Mareks symptoms, although I didn't have them necropsied, because I didn't know about Mareks. Last year I sold some chicks and they contacted me that one was ill and she thought it was Mareks. Later she emailed me that the necropsy was negative for mareks. So, I'm wondering if it really wasn't Mareks that killed my birds, but I don't vaccinate for anything to try & build resistance.
I have to say, I have a friend that vaccinated for everything, that I sent a hen to for a breeding program that we are startinng. She came back here, about a month ago, and has not shown any symptoms of Mareks or any other disease that they say can shed from exposing non vaccinated birds with vaccinated birds...
I guess we will have to agree to disagree here about Mareks and the ability to get rid of it. From what I have read it is possible and my experience so far has proved to be correct.
query.... What is the survival rate w/mareks and if they survive and they are used for breeding, will one create a mareks resistant flock?
Here is something that I've read recently and it makes sense. We are too often quick to breed from pullets and young hens. It is suggested that we should wait, & only breed from hens that are 2 years old or older. Why? because they obviously have resistance to a lot of things, and they are mature and show what they are really like. When we breed from young birds, we realy don't know what they will look like as true adults and might be breeding something that rears its ugly head as late as 2 years of age.
Makes sense to me.
And yes to your question. You may lose some birds in the first few years, but the resulting birds that survive and live on to an old age, should have resistance and hopefully pass it on to their young.