One of the fundamental philosophies behind (non-human) animal rights is that humans are not special beyond their specific abilities. That is, humans are not blessed by god, they were not created uniquely for a higher purpose and the life of a human animal is not inherently more valuable than that of a non-human animal. If there is greater value in the life of a human, then it would be because the fully-functioning human brain has a higher potential for pleasure and pain than that of a so-called lower animal. Beyond this occasionally enhanced potential for pleasure or pain, there is no reason (in my mind) to give an animal capable of pleasure or pain less consideration. Not to say that all farm animals should be given houses and furniture and fancy meals, because I don't imagine a cow or goat would appreciate those things. But I'm sure that even if the standard broiler chicken wouldn't appreciate Wi-Fi or indoor plumbing as much as I do it would still prefer not to be crammed in a cage with its beak sawn off. Even if it could be bred to not feel the pain of its amputated beak or its overstressed bones and joints the restriction of movement would still cause it mental anguish. It would live its pathetic life in fear instead of fear and pain. In a sick way, I suppose this is progress.