Piglets do not give suckling's maws when butchered. The reason Jorb gave for this was that pigs do not produce milk, even though piglets do indeed suckle at their mother's teets.
Horses do not produce milk either. However, a butchered foal produces a suckling's maw.
Either piglets need to start producing suckling's maws, or foals need to stop.
Let's have some consistency, please?