Greetings
Rainieb,
I've dealt with bumble foot quite a bit. Both in roosters and hens.
Bumble foot is simply a break in the skin, where bacteria enter and cause infection that goes unnoticed for awhile. It is most commonly caused by staph bacteria.
Bacteria is everywhere in the environment. No amount of cleaning can eliminate it, in a natural environment. Wild birds, insects, rodents and even a simple breeze, keeps bacteria and viruses mobile. Chickens themselves harbor many different bacteria in their bodies, as do all living things.
Perches are not the only way a chicken can get bumble foot. Anything that can cut or scratch the foot: wood splinters, small sticks, rocks, nails, glass, chicken wire, and the list goes on, can cause injury.
And many animals with soft foot pads get bumble foot, not just chickens. For instance, caged birds get bumble foot, their perches are round. Pet rats also get bumble foot. So you see, you have nothing to feel bad about. If you ran around barefoot, you might get it, too. But, probably not...people quickly attend to their injuries.
So, the question of how to prevent bumble foot still needs to be answered.
Protection of the feet. That's it, but how can you protect your bird's feet?
There are many things you can do. Start with their pen and coop. A soft substrate, such as sand or clean raked dirt is helpful. The perches should be smooth, sanding and feeling for splinters and/or sharp edges is helpful. If they leave the pen to free range, do your best to eliminate any debris around the property, that the chickens could cut their feet on.
Other than that, attending to bumble foot is something you'll have to do occasionally.
And some chickens, get it a lot. Like my rooster Mr. Frito. The vet says he just has a genetic predisposition for bumble foot, because his pads have thinner skin. Now, some keepers might just cull a rooster that is constantly injuring his feet. But, Mr. Frito is a great rooster; he is a valuable member of our pet family! So, he gets to wear chicken shoes that protect his feet. Of course, this presents other issues for Mr. Frito. In the Summer when temps are high, I need to remove his shoes for a week or two, sometimes. Or, he'll spend more time on our cooled, backyard patio. Also, some times a little pebble will get in the shoe. He lets me know, by lifting his foot, or limping. So, I still have to attend to his feet issues.
But at least he no longer has constant foot injuries. And if bumble foot if left unattended to, it can cause a chicken to go lame. It can even spread to the body and end the chicken's life.
It sounds like you are taking great care of your chickens, so don't worry so much. Let us know here on BYC, if you come up with another good way of caring for, or preventing, or managing bumble foot.
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Sometimes, even a hen will need to wear the shoes for awhile.
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These are my thoughts on your chicken's bumble foot issue. I hope they have been helpful.
God Bless