This is a great article covering the connection between animal slavery and human slavery, and how our violence against the animals is enslaving us: http://www.onegreenplanet.org/animalsandnature/what-are-the-roots-of-freedom-and-slavery/
He is also the author of one of my favourite books World Peace Diet by Will Tuttle. Have you read it?
http://www.worldpeacediet.org/ .He also has some very interesting lectures on his website, like this one: http://vimeo.com/17538152
enslavement of animals, the domestication, also has resulted in human
slavery, oppression against women, and other forms of oppression that is
rampant in our society. It is covered in this book that I want to read: