Nearest neighbor with any livestock is at least a mile away. They have a couple horses. Other than that, cannot think of any livestock near me.
Looking at the website, not sure if they are the same kind of fly.
What I have the most of, I have always known as "deer flies" they are bigger than a house fly, with spotted wings. Oh, man, their bites hurt, then ITCH!!
What I call a horsefly is huge, probably close to 2" wingspan. I am a bit allergic to them. Bites last for weeks. I don't see many of them. Whew! It is mostly deer flies.