What role can mechanical engineering play in free range farming? (problems free range farmers face)?

I'm in my third (final ) year in my Bs. in mechanical engineering .( we do a 3 year Bs. and a 2 year Ms. which is the equivalent of the 5 year BE. degree) .Anyways ,I have to present a senior project this year and I want to do something that is related to stuff i care about .

My question is this: What role can mechanical engineering play in making free-range farming more attractive to potential farmers( of course not mimicking factory farming) keeping animal welfare in mind?, Or stated differently ,what problems do free range farmers face that can possibly be solved through mechanical engineering .