Given the time of year, you are probably dealing with a family group. Whether the pups can survive without the adults is questionable this early in the summer. If they can't and you get rid of the adults, they will starve. If they can, then they will be as much a problem for your birds as the adults.
"I've asked my relatives who are farmers and local farmers who have suggested everything from electric fences to antifreeze laced cat food and going to the toilet around my garden in an attempt to over scent them."
Electric fence may be effective, but you will need several strands at differing heights to contain the chickens and exclude the foxes.
I always highly discourage poison. Poison is indiscriminate. It will as easily kill anything else that will eat the bait as it will the Fox. Anything a fox will eat will be eaten by any number of other animals: From voles, to weasels and mink, to raccoons, to skunks, to raptors that will eat the carcasses of the other poisoned animals (I realize you may not have all of those animals there, but other readers will).
I don't think you will find human urine or feces a deterrent.
Either containing your birds or trapping the foxes (all of them) is your best bet. A savy trapper will be able to locate the den and probably get the whole bunch in one night. Make sure your in line with the laws of your area for pest control...
"I've asked my relatives who are farmers and local farmers who have suggested everything from electric fences to antifreeze laced cat food and going to the toilet around my garden in an attempt to over scent them."
Electric fence may be effective, but you will need several strands at differing heights to contain the chickens and exclude the foxes.
I always highly discourage poison. Poison is indiscriminate. It will as easily kill anything else that will eat the bait as it will the Fox. Anything a fox will eat will be eaten by any number of other animals: From voles, to weasels and mink, to raccoons, to skunks, to raptors that will eat the carcasses of the other poisoned animals (I realize you may not have all of those animals there, but other readers will).
I don't think you will find human urine or feces a deterrent.
Either containing your birds or trapping the foxes (all of them) is your best bet. A savy trapper will be able to locate the den and probably get the whole bunch in one night. Make sure your in line with the laws of your area for pest control...