[Justin]

tantrixfafa: I am sorry for my misunderstanding. I can see that your belief on outdoor piggies is similar to "religious belief" rather than "scientific belief."

I found a good deal of reading materials on piggy behavior including that from this website. For example, pigs will popcorn when you put them in outdoor pen for excitement and/or happiness. When they are left alone for cold and scary night, they are often too frightened, cold, or hot to appraise the "happiness."

I had also found my ego being hurt repeatedly by information against my "belief," especially on outdoor cage and breeding. But as I read more and more, I had to submit my "belief" to superior logic and overwhelming proofs.

I think I am suggesting that(reading lots of information) to you as well.