August of 2011 I treated 3 of my 4 chickens for bumble foot. After weeks of salt, Tricide neo, Neosporin and bandages every day, the bumble foot cleared up. Since then I acquired 3 more adult chickens, none of which had bumble foot when I got them in October. Fast forward to today and 1 of my original 4, and 2 of my new chickens have bumble foot. I am at a total loss as to what is causing this. Their perch is smooth. I got rid of sand in the run and replaced with straw( they don’t spend much time in there anyway). My yard is half green grass, half dead grass and dirt. There are lots of small pebbles, but I can’t really de-pebble my yard. There is nothing rough or so abrasive as to open up their feet to infection.
What am I missing?
What is causing this to affect so many of my chickens?
How can I protect them from this?