I lost my first flock of birds to Marek's. Years ago before I had any real experience keeping birds. My wife decided to rescue a silkie and nurse it back to health. Obviously a big mistake and a costly lesson learned. After watching several birds succumb to Marek's, we de-populated the rest of the flock. We've vaccinated ever since (exception discussed later) and don't bring any live birds onto our farm.
Fast forward years later and we had a bird we bought from MPC develop Leukosis and again, we de-populated. That has been several years and since then, we only hatch our own eggs. We got our initial stock from Dick Horstman (mostly) mixed with a few local eggs to make the kids a small fun egg flock (EE's Svart Hona, etc).
I'm in the opposite camp in that I think for the long run, it's better to start hatching your own birds and getting comfortable with the vaccination process. It's simple and one the first time squeamishness and nerves are out of the way, it goes pretty quick.
I cant find the link presently, but at the time had been told Marek's can stay on the property for a year or 2. My current mutt flock, I chose not to vaccinate to test for the presence of Marek's as a precaution (mind you, this is 7 or 8 years later). They're all alive and well so confident there isn't an active strain of Marek's present. We still vaccinate our birds as a precaution and I recommend doing the same.
On 'Marek's Disease resistant birds.' Mostly myth. It's possible, with decades of generations. Fortunate enough to be close to a couple of universities with good agriculture, livestock, and poultry programs. He's the quote I tend to believe when someone tries to sell my on the idea of Marek's resistant birds. (the
bold is a headline of common myths and misconceptions, not advice)
- Don't vaccinate birds so that the survivors will become resistant. Genetic disease resistance takes decades to develop and so far, has not been successful with Marek's Disease. If it were successful, one would think the commercial chicken genetic companies would have developed resistant chickens by now.