Hi. Boy there is alot of good information given here on this thread! I was at BYC in those days when a bunch of us were just discovering it was not rare., and what's making our chickens die. At that time I had hatched 10 perfect GLPolish. 3 started limping, then gasping. One by one they got one leg paralysis and had to be put down. I cried my eyes out.I really would love to hear more about breeding for immunity--thank you! And you are right. We would need a rooster coop or get ready to cull on that.
A few months ago my first hatched chicken died at 12 years old , never vaccinated. I found there were some older chickens in my flock that were never symptomatic. They lived a long life. From then on all chicks were vaccinated day 1 or 2 of life and kept under quarantine for 3-4 weeks. I had separate tops or aprons to use , washed my hands and tried to do most of their care first thing every day. Right now all my chickens are vaccinated (18) except for one red hen that was found wandering around my neighborhood. She was already an adult.
I buy my chicks already vaccinated at the hatchery. Or I do it. After you give a few injections , you will be an expert. My first ones were real hard for me. So I learned that moistening the downy injection area so I can see skin. Pinch up the skin and inject. Don't put the needle in far, just far enough. I don't hatch eggs anymore because I keep the roos and I have 6 right now, Silkies.
Breeding for resistance. Well I had a bunch of adult hens prior to Marek's that were not affected. I also had a hatched chick go to a clean home for 6 months, then came back to me when they decided to eat him. He was never symptomatic. So I think age has resistance just because of age.
Getting a Marek's vaccination is like a "safe" exposure that signals their immune system to be resistant. Exposure to the virus is the " unsafe method". Either way, their resistance is built because of an exposure , not birth. Some, I think, get resistant with age . I think it must be their general overall resistance. Chicks do not get exposed inside the chicken, and exposure does not penetrate an egg.
Marek's is known to be present for over 100 years. Over 100 years of scientific research has been done already including breeding for resistance. Try to find some research information that was not done with Dr. Google or the Chicken Lady.
Keep a closed flock. I broke that rule one time at a show for a cute silkie hen, and then my flock had Marek's.
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