Pigs can have a sense of numbers, like any herd animal. I get your point. But there are breeds and breeds.

To my very limited personal knowledge, landrace breeds tend to be more like that, especially breeds selected to be grazed and kept outside, which made sense as it would be desirable to have a closely knit group, where individuals would look out for each other. And this gave rise to breeds that can be extremely dangerous to other animals, including humans.

Talking with a few pig herders that live around the area I live, Inwas told more "modern" pig breeds tend to be less group and motherly care driven, to the point of sows mauling piglets out of food drive.