So sorry!
Just to share from my hours of research. If you trap the foxes in your area, next season or the next more will return to fill the gap. Nearby females will even have larger litters....It's just nature.
I don't believe that feeding the wildlife my chickens is "nature". They have their own food. But how to deter, how to deter?
Is there anything else you can do? Fence a large area for when you are not around? (not heavy duty, possibly just wire with step ins or the fiberglass rods and then a couple strands of electric poly wire? Does work very well.
ETA - if you have the funds. Electric Poultry fence would be a great way to go. Gives huge amount of protected square footage, and it's portable.
Ali:
Been fighting that battle...so far, traps have not been successful (no matter how many youtubes I watch) this is for either the have a heart or the leg hold types....I believe I have had some success with play a radio when I am not there (and I have some trepidation that the fox will acclimate to the sounds)....if the dog is out, they will not come around, but he won't stay in the back yard...
I was able to find 'a den' and destroyed it, but, the fox didn't move on as hoped...
Just an FYI, I have seen the fox clear my 4' fence with no problems...I've heard that can get over a 6' fence...fencing won't work....I had thought of throwing old fashioned moth balls around the perimeter of the property.....just a thought....