Earlier quoted context omitted.
Funny, looking at the associated picture tells me a different story. Look at how uncrowded the chicks are and how much free space to move they have, and compare with US where they are so packed together that they can't even turn in place. http://www.nationalgeographic.com/content/dam/magazine/right...
It seems strange to point out how well you are treating an animal when you are slaughtering it for consumption in the end. In fact that is the animal's only purpose of existence.
From an evolutionary point of view you could say that cows, chickens, pigs (and cats, dogs, horses) are one of the most successful animals, exactly because we eat (or pet) them.