I'm not sure how many barn cats I have at the moment, 2 for sure sometimes more. I can't catch any of them, they just come to eat and sleep. I have a small opening in my barn, just big enough for a cat to get through. I've been feeding them for maybe 10 years, out of the 15-20 cats that have been out there, only 2-3 have been friendly enough to pet.
I don't keep a litter box and I never go looking for cats. They get dumped or they just show up feral and I feed them. I have no mice in my feed barn and if they leave my chickens alone they are welcome to stay.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France