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I thought Food Inc was a book in it's own right.
I have read The Omnivore's Dilemma and Food Inc.
The Omnivore's Dilemma can, at times, be a dense and difficult read. For anyone planning to read it, keep in mind that there is a thousand times more information in there than anyone really needs (extensive histories, etc.), so don't be afraid to skim through the denser parts if you want to. But I definitely recommend it.
The bulk of Omnivore's Dilemma discusses the industrial food industry and how unnatural most processed "food" is. Food Inc. the book (not the movie, which I haven't seen yet) is a collection of essays on different issues focusing more on the industry itself and how to get away from industrial food. There is some overlap though.
To answer the OP's questions, I don't remember if it influenced me getting chickens, and it did not influence a venture toward meat birds since I'm a vegetarian.
I just finished Pollan's next book, In Defense of Food, and it has a lot of interesting information as well. Sort of a history of food science and nutritionism, which have made the food industry what it is today. It also talks about how we as a culture look at food and how that influences how we eat. I recommend it as well.
Now I'm reading permaculture books to figure out how to best design my sustainable garden to leave the food industry, and even the industry's hybrid vegetable seeds, behind for good. (Well, as much as I can, anyway....)