The stardew wiki states that pigs should essentially have a 100% chance to produce a truffle if released on free land. I guess I'm not sure what "free" means...But, my pigs have about 20 spaces EACH, only comprised of grass and dirt. And they're producing at a rate of about 30%.

I've had success in the past on different playthroughs. The only difference between those and this playthrough is that I'm having the pigs share a space with other animals, that there's more grass, and that I've given them MORE room.

Does anyone know what's going on? Has anyone figured it out? Because the past threads haven't given any solutions to what seems to be a common problem.