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Not that you're wrong about US factory farming, but this article (and the photos) are only concerned with Canada. It's, unfortunately, not just a US problem.

Singer’s Animal Liberation in the 70s had an impact on most of the world whereas in the US animal welfare got worse as farm sizes continued to increase and farms industrialized.

I'm glad to see this book mentioned. It's a good read. Not dogmatic. It explores several angles from which to think about the welfare of animals in the custody of humans.

It was a picture of a Canadian farm.