It's called a herd for a reason. Usually if you've found one cow you've found them all. In the wild any cow with genes for aloofness quickly got culled by predators.

The exceptions are the lame & sick ones, but no fancy gadget is going to bring them in; you've got to take a truck to them.

The herd does fracture and split up. Cows aren't usually alone but they will split into smaller groups.

That said, when they see the whole group moving they want to join in.

On bigger open ranges you do have to count and go explore to find the two rebels that decided they wanted to be on the other side of the mountain :)