While you have pigs on a treadmill you are able to breed pigs.

However when the mother (first one you feed) gives birth she falls off the treadmill, just because she has given birth does not give her the right to get off of the treadmill.

Pigs do not have any parental leave after birth, I googled it.

I agree.

Not sure why, but this made me laugh.

As if it wasn't bad enough animal cruelty that you're forcing them to run to generate power without any paychecks off breaks.