PRELIMINARY RESULTS ARE IN!
I could not be more impressed with our state lab. THey received the bird at 9 am today and called me at 11 am with a preliminary assessment based only on the physical dissection and exam- ie no microscopic slides or lab tests are done yet. The very kind, helpful lady who phoned was a Dr. (vet or ph.D I don't know) and made the following observations:
1) The bird was very thin with almost no fat anywhere on her body.
2) There was an abnormally high amount of blood in the intestinal track.
3) The lower intestinal track was more watery than usual
4) The bird had a great deal of decomposition, even though it just died yesterday and had been kept cool ever since-including in route.
She went to some length to repeat the fact that the final test results may very well show something different, but based only on what she saw via the exam, she suspects........ Coccidiosis.
I had included a letter in which I listed every conceivable bit of information I thought could possible have an impact, including the dead opossum, my spraying of fruit trees (she asked for name of the spray and active ingredients, but doubts its an issue), the fact that baby chicks live and eat and drink the same thing as the dead ones, the fact that my pond water is really low and could have been an issue-especially since I saw tiny life forms in it, and so on. We went through all these fact and she was extremely informative and offered what I felt were very educated/experienced/informed opinions on all those things. I was most interested by the baby chick issue.....she said it was likely had to do with the life cycle of the parasite. That the baby's may have it but it hasn't reached a point where its causing serious harm/death, whereas the group of 4 month old's that all the deaths occurred in could have all been exposed at the same time in the past and it just now reached the overload threshold that caused their death.
The good news: Thanks to people on this board, I actually HAD ALREADY STARTED TREATING FOR THIS 2 DAYS AGO (just in case) and have had no more deaths. I suppose that also lends some support to the diagnosis?
In his/her post on this thread, tenchicks seemed to be a bit aggravated that I had not already started a prophylactic treatment, and I think that critisizim is fair. I had started treatment by the time of that post, but I now think I probably should have been treating my chickens for this all along. Do most of you do that? My only defense, and I'm not saying it is a good one, is that for 4 years I've had chickens and I keep them well fed, provide good shelter, etc and have never had any death or illnesses (except predators) so I just didn't think it was a big deal. Should I have known? Yes. I suspect tenchicks and others would say if I'm going to take the responsibility of having an animal I need to be informed enough to provide an acceptable standard of care, and that is true. If you wondering, of course I feel very bad that many of my chickens died from something that likely could have been prevented. Its a shame, its irresponsible, and it will not happen again. The lady from the lab said most small hobby chicken owners don't treat or even know about cocci and I shouldn't feel bad, but she was probably just being kind and either way, I should have known and treated my birds. I can only hope that this experience will help others on this site who read this thread to consider preventative treatment of their birds. The first thread in the forum when I logged on was from someone asking for help and saying they may have cocci, and I know there are hundreds of others over time on here as well. So I am not alone, but maybe my experience will encourage others to treat their flock before they go through what I just did.
Thanks for everyone's help and concern. The lab lady said the full work up will be done in about 10 days and I will get an e-mail with the final results. I will post them on this thread when I get them.