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I can't remember having a lot of health problems which chickens while I was growing up and into my early teens when my parents had flocks. They were healthy but then my folks didn't keep them around long enough for them to really develop any.
Those were the good old days. Times have changed. You don't necessarily need to keep birds long for modern diseases to develop. Many here on BYC and other places online have reported having health problems with chicks and baby waterfowl, particularly those shipped from some of the large hatcheries. I know someone who lost an entire hatch of expensive goslings to some Mycoplasma that they caught from ducklings shipped from a bad hatchery that were being raised together. A complete loss as every bird died before they even reached 6 weeks old. Mycoplasma is a tiny genus of bacteria that antibiotics are worthless against. Mycoplasma can be passed from a sick bird to its egg that it lays and once the bird hatches it is almost always a death sentence for the hatchling and any other unfortunate babies being raised with that sick hatchling.
Some breeds are naturally more disease resistant than others, but sadly there are hatcheries out there who have very poor/inferior lines of the breeds they sell, caused by factors including but not limited to inbreeding and diseased breeding birds.
On a less depressing note, Egyptian Fayoumis are probably one of the top 5 disease-resistant chicken breeds in the world and the ONLY breed known to be completely immune to Avian Influenza (commonly known as the Bird Flu). Not that I worry about it much, Eucalyptus leaves have been reputed to treat and even cure Avian Influenza, in humans as well as fowl. Of course, that could only be of help to an otherwise relatively healthy bird that has a functioning immune system.
Major CAFOs with sick -- rephrase that, dying -- egg-layers and broilers have plenty to worry about because their sick birds are so far past saving that nothing will help them and they die within hours of exposure to any strain of the influenza virus, whether it be Avian ("Bird") or even human. The irony is, that with all of the "biosecurity" the major factory farms claim to practice, including requiring employees to 'shower' their vehicles driving through a special gate with an all-around car wash every time they drive in; according to a former employee of a massive operation only the laborers are required to also shower themselves with a disinfecting liquid chemical before entering the premises and afterwards change into a separate set of clothes and masks. The management personnel, on the other hand, come and visit -- not everyday of course but somewhat on a regular basis, in his experience at that particular plant it was about monthly -- and are NOT required to shower, change their clothes or wear masks. Which leads one to wonder if any of the 'bird flu epidemics' back in 2015 were caused by such management persons who perhaps unknowingly carried the virus and introduced it into those air-tight facilities of theirs, thus potentially killing their own birds - and profits. You never know, the management person(s) might have eaten chicken at a nicer restaurant, but the chicken was a CAFO chicken -- who would've tested positive for Bird Flu before butchering if it had been tested for safety, which it almost never is -- or perhaps he was traveling inside a airtight jet with someone who came from an area of the world that had avian influenza at the time; and then you can just imagine the havoc that that one person spreading germs (by breathing inside of a sealed facility) can create when filled with those poor, sick, immune-suppressed miserable creatures whose immune systems are already failing because they cannot function properly due to reckless breeding, GMOs, antibiotic abuse, growth hormones, deadly, diseased-animal-byproduct-feed, mercury and lead and other poisonous injections, etc.
While not an ideal situation, there were reports of small flocks of older breeds of purebred chickens that were kept in the vicinity of some of these CAFO operations where the CAFO flocks died of bird flu but despite the fans blowing at the neighbors' flocks, the older breeds survived mostly unaffected. (The dreaded look-who-moved-next-door and built what! scenarios.) Thankfully, I've never had to live near one of those disease-infested smelly places! But that was during the bird flu 'scare' that the media kept going on about (bear in mind some of their sponsors are pharmaceutical corporations who love all the money they make from CAFO owners and who want our sympathy for their point of view - their point of view being how much the world needs flu vaccines even though they haven't produced one decent study to prove they actually are safe and might work plus they only contain one strain of the virus when there is ALWAYS more than one strain per year).
[Getting back to Eucalyptus, hopefully the government will NOT approve the planting of Genetically Engineered Eucalyptus trees that they are planning to introduce in the Southeast soon....]
Consider an Egyptian Fayoumi chicken, for example -- hopefully raised humanely and with proper nutrition, air flow, sunlight and care. It wouldn't be bothered at all by avian influenza because there was a study done that showed they were completely resistant to it -- their immune system is so strong naturally that the virus does not take hold and multiply.
And many of the less dangerous ailments poultry owners deal with could be prevented or avoided altogether with proper ventilation and air flow, too many coops are not built with these principles in mind. There is a highly recommended book on poultry health written by a medical doctor that is a MUST-READ for ALL poultry owners, and that should be on one EVERYONE's shopping list:
Fresh Air Poultry Houses by Prince T. Woods, M.D. Here's a sample chapter:
http://www.nortoncreekpress.com/wor...es_a/fresh-air-poultry-houses-sample-chapter/
DISCLAIMER: This posting exists as an informational and educational resource only. I do not provide medical or veterinarian advice nor do I offer prevention, diagnosis, treatment, or cures for any diseases or medical conditions. Please consult a health or veterinary professional for medical and veterinarian advice—do not consult my writings. These statements have not been evaluated by the FDA. Remedies are not intended to treat, cure, prevent or mitigate disease. Only your body, or the body of an animal, can cure itself and prevent disease. I am not a medical or veterinarian professional or physician. Therefore, these writings are for informational and educational purposes only.