My pen is capable of 12 or 13 boars til they stop breeding. I check from time to time if they reach the limit, then cut the population in half so they go on breeding. There are more effective ways of boar farms (check utube), but I find it more imersive to have a small pen with my piggies 🐷...
Still need to find 1 or 2star pigs to get more meat out of my farm.