[ali's_pigs123]

If you are willing to use a hay rack, I suggest a suet bird feeder. I have a small one for one pig that I bought at Christmas Tree Shops for $0.89. It works very well. For a group of piggers, use a few of these, or a larger one.
As for pellets, don't use Hartz, Kaytee, or SunSeed.
Use Mazurri5664, Oxbow, KM's, or SweetMeadow.