I'm currently unconvinced either way on this matter. However, enough arguments have been raised that I think this is worth the time of every reader to think a good deal about.
Pretty sure the unpacking goes like "I think it is 20% likely that a moral theory is 'true' (I'm interpreting 'true' as "what I would agree on after perfect information and time to grow and reflect") in which hurting cows is as morally bad as hurting humans."
I'm currently unconvinced either way on this matter. However, enough arguments have been raised that I think this is worth the time of every reader to think a good deal about.
http://nothingismere.com/2014/11/12/inhuman-altruism-inferential-gap-or-motivational-gap/