Full size pigs can breed between 8 and 10 months and generally won't breed if they're too small/young. But "mini" used to mean "when compared to 600-1000# adult pigs", and so meant pigs who maxed out between 200-300# full grown. Those can and will bred at the same age and be fine.That’s interesting. I don’t know anything about pigs but wanted to see what IS the right age to breed.
Now, people think microscopic when they think of mini pigs and want 3yo pigs that weight 30#, That is a really, really recent development in pighood and we're going to have to be really careful breeding for that for at least the next 50 generations (roughly 75 years) while we work the kinks out of that.