When I was a kid the pigs we had had rings put in. It was awful and I don’t remember that it did any good at all apart from making the pigs miserable, one even managed to pull the ring out and bleed every where (the vet had to be called, very distressing and big bills), I'd never use them on my pigs, instead I have penned the field so they get moved around, doesn’t give great amounts of green but means different areas get rested, (I'll have a think about the clover grass as that may help.)
As for the create I hated the idea of using it until Joanna (a large white) had per babies out she killed 10 only 4 lived, it was horrendous not being able to get to the babies or her to help, she was so aggressive, in the end we got the neighbours down who tipped the arch over, somehow they got her in a shed, in a create (I'd run to the house crying couldn't stand the yelling, pig shouting and the babies dieing. I was only 12 at the time!!)
I have mangalitzas now and have been very worried about the farrowing needless to say both the sows have had they litters in a large shed without the use of a create, I’m very proud of my girls and next time i think they will be fine having them out.
I love seeing my girls out and doing as nature intended rooting around!!!