Wow! What a great opportunity for you! They must like your work very much to have asked you to combine your work with theirs. I wonder if it would help to find out which of your photographs caused them to decide that you're the one to do this project for them?
Something that helps me with photo projects is to put words together related to possible themes. For instance, in your case, "Open Farming In An Open Society", "What's the Big Deal?" and "Pigs Love It Here" are three thoughts that came to mind after reading your original post. With these thoughts, I would come up with photographic ideas. This is the short version of what I do, and, since we all work differently, I'll stop here.
Can't wait to see what you come up with. I'm sure it will be fantastic!