Rights are determined by the strong, I'm sorry that it's not very morally sugar and chocolate sounding but that is history and the nature order of the world (darwin's theory of evolution comes to mind.) At the very basic of rights is the right to survival, if you believe in absolute basic rights (the right to live) the fact that beef are yummy for the tummy is an infringement on animal rights. Which brings me to my next point...
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I would also posit that if "rights" have a conflict of interest with the "rights" of someone else than what atleast one of those parties are asserting aren't rights at all.
Thats a good point, the question is who decides who is more right (teehee). When your right for survival (eating of steak) clashes with the cow's right for survival, what happends then?