You're spending a lot of time creating a lot of threads to ask a lot of questions. It will be a better use of your time to start with reading through all the information in
the newbie thread as well as all the stickies on the forum and everything on
Guinea Lynx. There's a lot you need to know and this is the best way to start learning it all. After you read all that, forum searches can often answer very often asked questions such as this.
As far as the question you posted in this thread: for a pig over 6 months old they need an unlimited supply of grass hay. That cold be timothy, blue grass, orchard grass, ect. This does not include alfalfa.