Flock with probable MG infection... how to proceed?

MySuburbanLife

In the Brooder
7 Years
Jun 24, 2012
58
3
41
Suburban Seattle
In early June I picked up 7 day-old chicks from my local feed store. 2 Easter Eggers, 2 Barred Rocks, 2 Buff Orps, and 1 RIR/Production Red. They were healthy and happy and grew up fast in their pack n play brooder in our living room, and my children and I enjoyed socializing them. When they were 5 weeks old, I moved them into the coop I built. It is well-ventilated, with a covered attached run. The move was successful, and everyone had settled in comfortably.

When they were 7 weeks old, a friend and I went to look at some chickens from a Craigslist ad. She came home with two, and I came home with two-- a buff and a black Silkie, 5 months old. They looked good, and I asked the owner about their health-- she said everyone was healthy. I brought them home and introduced them to my flock, more concerned about them getting along than being a health hazard to my girls.

One week later, I completed the fencing around the chickens' daytime run and let them all out to explore. 8 of the 9 chickens happily ran around the new space, eating grass and chasing bugs and dust bathing. One of my 8 week old EEs, the one who has been the most curious, the most social, the most affectionate, stayed behind. She was standing with her head tucked under her wing and wasn't interested in exploring. I went and picked her up and noticed that she was wheezing with each breath.

I brought her inside and set up the pack n play brooder again. Quick exam showed no throat obstruction, but she had clear discharge from her nostrils. It was odorless, but dripping. Her face was swollen right under her eyes, like tiny water balloons under her skin. Uh oh. Went to the feed store and picked up Duramycin-10, and started treating her right away. Decided to treat the rest of the flock out in the coop too, just to be safe.

The next morning I went to check on the other girls in the coop and examined each one-- the black Silkie had nasal discharge too, and it was bubbling on her nostril every time she breathed. Into the pack n play brooder with her, too. Checked the flock again in the afternoon, and two more chicks (the other EE and the RIR) had nasal discharge and very swollen faces. I didn't bother bringing those two into the brooder because I figure it's too late-- they're all infected, and I have some decisions to make. At this point only the first EE is wheezing, although all 4 of the affected birds have swelling and nasal discharge. They are eating and drinking normally and are slightly lethargic, but still walking around.

I've read dozens of threads on BYC about MG, and even though all the symptoms fit and I have a feeling I know what needs to be done, I think I'm in denial. This is my first flock, and I'm so torn up that a naive mistake I made may have led to this.

1. Is this MG?
2. Did it come from the Silkies, or could it be something wrong with my coop?
3. Should I continue to treat the entire flock with antibiotics and hope for the best?
4. Should I *gulp* cull everyone, disinfect, and start again, promising to never ever add birds without quarantine ever again?
5. If I decide to keep them, what impact will this have on their laying, and will I be able to eat any of the eggs they produce?

Thanks for holding my hand through this. My emotions are clouding my judgment, and I need help.
 
It sure sounds like MG, Mycoplasma Gallisepticum. An air sac disease that causes cold like symptoms and swollen sinus's. It can be passed down from the parents via the egg, or from introduced birds. MG is the most common chronic respiratory disease of chickens.

The best antibiotics to use are Baytril, Erythromycin or Tylosin. However many of the tetracyclines work as well....Chlortetracycline, Duramycin, Oxytetracyline or even Doxycycline. These antibiotics are quite effective in treating MG. Which ever antibiotic you use, continue the meds for several days to one week after you see no symptoms.

There is no reason to "Cull" them, and they can be cured. They WILL be carriers the rest of their days however. You will never know if the Silkies brought it in, or they had this from their hatch. It is highly contagious and your entire flock is no doubt carrying it. You should probably treat the entire flock.

It will not affect their laying and after the egg withdrawal period, depending on which antibiotic you use, the eggs will be perfectly fine to eat.
 
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Quote: That is rather a contradiction, though. They cannot be cured if they remain carriers, which they will if this is MG. They can become asymptomatic, but that is not considered "cured". Antibiotics will treat symptoms of bacterial infections, but will not change the carrier status of that type of disease.

If you do not want to treat and retreat relapses, yes, you would have to cull them. If you don't, every bird you bring in will contract the disease. If you don't mind that type of inconvenience, as well as not ever being able to ethically sell the birds or eggs, then by all means, treat. My choice would not be to treat contagious respiratory illness.
 
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I don't plan on selling birds or eggs-- I purchased my flock with the sole intention of providing eggs for my family. None of my pullets are laying yet, so there is no issue with this current round of antibiotics, but if and when they start showing signs of infection again and I start them back on antibiotics, I'm assuming I will have to waste the eggs they lay while they are being treated and for two weeks after. Is this true?

Also, if they had this from their hatch could the stress of adding the silkies cause the illness to become symptomatic? I got my original 7 chicks from a local feed store who gets their birds from a hatchery in Texas, although I didn't ask which specific one. Is it common for hatchery chicks to be carriers of MG?
 
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I got my birds from the feed store, hatchery birds, and they came with MS, the sister to MG! LOL..So yes, they can come with disease. I am working with MS in my flock as well. I do not sell the eggs or birds and they are just the family pets. So I go thru the steps to save them no matter what. Only you can decide what to do with them. As long as they are happy and enjoying being chickens, keep them around for the enjoyment and the eggs.

You mentioned you were treating them with Duramycin....there is a 21 day egg withdrawal on Duramycin.
 
It depends on their immune systems. If I were you, I would occasionally add vitamins, minerals, probiotics, amino acids, etc...to the water or feed to boost their immune systems. A healthy bird can go nearly the rest of their lives without any more symptoms. Only if they get really run down will they show symptoms.
 
Option 1: Cull them all, disinfect, start over. But how can I be sure my new chicks are MG-free? I don't want to go through this again!

Option 2: Continue the current course of antibiotics, close the flock, keep them healthy and happy, and hope they don't have another relapse. That would make my flock one of the 90% infected with MG, although that statistic seems suspect. Are all these MG flocks just not showing symptoms because they're not stressed, so the flock owners aren't aware?

Thanks for all your input and support, guys. Much appreciated.
 

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